diff --git a/proto/backend.proto b/proto/backend.proto
index 402fa1b54..3fcb56a3a 100644
--- a/proto/backend.proto
+++ b/proto/backend.proto
@@ -264,6 +264,8 @@ message DeckTreeNode {
     uint32 review_count = 6;
     uint32 learn_count = 7;
     uint32 new_count = 8;
+
+    bool filtered = 16;
 }
 
 message RenderExistingCardIn {
diff --git a/pylib/anki/schedv2.py b/pylib/anki/schedv2.py
index 83e908f01..5913fd217 100644
--- a/pylib/anki/schedv2.py
+++ b/pylib/anki/schedv2.py
@@ -15,7 +15,7 @@ from anki import hooks
 from anki.cards import Card
 from anki.consts import *
 from anki.lang import _
-from anki.rsbackend import FormatTimeSpanContext, SchedTimingToday
+from anki.rsbackend import DeckTreeNode, FormatTimeSpanContext, SchedTimingToday
 from anki.utils import ids2str, intTime
 
 # card types: 0=new, 1=lrn, 2=rev, 3=relrn
@@ -232,6 +232,10 @@ order by due"""
         "List of (base name, did, rev, lrn, new, children)"
         return self.col.backend.legacy_deck_tree()
 
+    def deck_due_tree(self) -> DeckTreeNode:
+        "Returns a tree of decks with counts."
+        return self.col.backend.deck_tree(include_counts=True)
+
     # Getting the next card
     ##########################################################################
 
diff --git a/qt/aqt/deckbrowser.py b/qt/aqt/deckbrowser.py
index 883e1c1d9..5470dad0c 100644
--- a/qt/aqt/deckbrowser.py
+++ b/qt/aqt/deckbrowser.py
@@ -6,12 +6,11 @@ from __future__ import annotations
 
 from copy import deepcopy
 from dataclasses import dataclass
-from typing import Any
 
 import aqt
 from anki.errors import DeckRenameError
 from anki.lang import _, ngettext
-from anki.rsbackend import TR
+from anki.rsbackend import TR, DeckTreeNode
 from anki.utils import ids2str
 from aqt import AnkiQt, gui_hooks
 from aqt.qt import *
@@ -39,8 +38,13 @@ class DeckBrowserContent:
     stats: str
 
 
+@dataclass
+class RenderDeckNodeContext:
+    current_deck_id: int
+
+
 class DeckBrowser:
-    _dueTree: Any
+    _dueTree: DeckTreeNode
 
     def __init__(self, mw: AnkiQt) -> None:
         self.mw = mw
@@ -83,7 +87,7 @@ class DeckBrowser:
             draggedDeckDid, ontoDeckDid = arg.split(",")
             self._dragDeckOnto(draggedDeckDid, ontoDeckDid)
         elif cmd == "collapse":
-            self._collapse(arg)
+            self._collapse(int(arg))
         return False
 
     def _selDeck(self, did):
@@ -106,7 +110,7 @@ class DeckBrowser:
 
     def _renderPage(self, reuse=False):
         if not reuse:
-            self._dueTree = self.mw.col.sched.deckDueTree()
+            self._dueTree = self.mw.col.sched.deck_due_tree()
             self.__renderPage(None)
             return
         self.web.evalWithCallback("window.pageYOffset", self.__renderPage)
@@ -143,53 +147,49 @@ where id > ?""",
         buf = self.mw.col.backend.studied_today(cards, float(thetime))
         return buf
 
-    def _renderDeckTree(self, nodes, depth=0):
-        if not nodes:
-            return ""
-        if depth == 0:
-            buf = """
+    def _renderDeckTree(self, top: DeckTreeNode) -> str:
+        buf = """
 <tr><th colspan=5 align=left>%s</th><th class=count>%s</th>
 <th class=count>%s</th><th class=optscol></th></tr>""" % (
-                _("Deck"),
-                tr(TR.STATISTICS_DUE_COUNT),
-                _("New"),
-            )
-            buf += self._topLevelDragRow()
-        else:
-            buf = ""
-        for node in nodes:
-            buf += self._deckRow(node, depth)
-        if depth == 0:
-            buf += self._topLevelDragRow()
+            _("Deck"),
+            tr(TR.STATISTICS_DUE_COUNT),
+            _("New"),
+        )
+        buf += self._topLevelDragRow()
+
+        ctx = RenderDeckNodeContext(current_deck_id=self.mw.col.conf["curDeck"])
+
+        for child in top.children:
+            buf += self._render_deck_node(child, ctx)
+
         return buf
 
-    def _deckRow(self, node, depth):
-        name, did, due, lrn, new, children = node
-        deck = self.mw.col.decks.get(did)
-        collapsed = self.mw.col.decks.get(did)["collapsed"]
-        if collapsed:
+    def _render_deck_node(self, node: DeckTreeNode, ctx: RenderDeckNodeContext) -> str:
+        if node.collapsed:
             prefix = "+"
         else:
             prefix = "-"
-        due += lrn
+
+        due = node.review_count + node.learn_count
 
         def indent():
-            return "&nbsp;" * 6 * depth
+            return "&nbsp;" * 6 * (node.level - 1)
 
-        if did == self.mw.col.conf["curDeck"]:
+        if node.deck_id == ctx.current_deck_id:
             klass = "deck current"
         else:
             klass = "deck"
-        buf = "<tr class='%s' id='%d'>" % (klass, did)
+
+        buf = "<tr class='%s' id='%d'>" % (klass, node.deck_id)
         # deck link
-        if children:
+        if node.children:
             collapse = (
                 "<a class=collapse href=# onclick='return pycmd(\"collapse:%d\")'>%s</a>"
-                % (did, prefix)
+                % (node.deck_id, prefix)
             )
         else:
             collapse = "<span class=collapse></span>"
-        if deck["dyn"]:
+        if node.filtered:
             extraclass = "filtered"
         else:
             extraclass = ""
@@ -200,8 +200,8 @@ where id > ?""",
             indent(),
             collapse,
             extraclass,
-            did,
-            name,
+            node.deck_id,
+            node.name,
         )
         # due counts
         def nonzeroColour(cnt, klass):
@@ -211,16 +211,17 @@ where id > ?""",
 
         buf += "<td align=right>%s</td><td align=right>%s</td>" % (
             nonzeroColour(due, "review-count"),
-            nonzeroColour(new, "new-count"),
+            nonzeroColour(node.new_count, "new-count"),
         )
         # options
         buf += (
             "<td align=center class=opts><a onclick='return pycmd(\"opts:%d\");'>"
-            "<img src='/_anki/imgs/gears.svg' class=gears></a></td></tr>" % did
+            "<img src='/_anki/imgs/gears.svg' class=gears></a></td></tr>" % node.deck_id
         )
         # children
-        if not collapsed:
-            buf += self._renderDeckTree(children, depth + 1)
+        if not node.collapsed:
+            for child in node.children:
+                buf += self._render_deck_node(child, ctx)
         return buf
 
     def _topLevelDragRow(self):
@@ -265,10 +266,21 @@ where id > ?""",
         self.mw.col.decks.select(did)
         self.mw.onDeckConf()
 
-    def _collapse(self, did):
+    def _collapse(self, did: int) -> None:
         self.mw.col.decks.collapse(did)
+        self._toggle_collapsed_in_node(did, self._dueTree)
         self._renderPage(reuse=True)
 
+    def _toggle_collapsed_in_node(self, deck_id: int, node: DeckTreeNode) -> bool:
+        "Toggle collapsed on deck in tree. Returns true if found."
+        if node.deck_id == deck_id:
+            node.collapsed = not node.collapsed
+            return True
+        for child in node.children:
+            if self._toggle_collapsed_in_node(deck_id, child):
+                return True
+        return False
+
     def _dragDeckOnto(self, draggedDeckDid, ontoDeckDid):
         try:
             self.mw.col.decks.renameForDragAndDrop(draggedDeckDid, ontoDeckDid)
diff --git a/qt/mypy.ini b/qt/mypy.ini
index 5f88a2a12..bdee644c0 100644
--- a/qt/mypy.ini
+++ b/qt/mypy.ini
@@ -62,3 +62,5 @@ check_untyped_defs=true
 check_untyped_defs=true
 [mypy-aqt.preferences]
 check_untyped_defs=true
+[mypy-aqt.deckbrowser]
+check_untyped_defs=true
diff --git a/rslib/src/decks/tree.rs b/rslib/src/decks/tree.rs
index ff7a0386d..d5daeb7e2 100644
--- a/rslib/src/decks/tree.rs
+++ b/rslib/src/decks/tree.rs
@@ -62,16 +62,21 @@ fn add_child_nodes(
     }
 }
 
-fn add_collapsed(node: &mut DeckTreeNode, decks: &HashMap<DeckID, Deck>, browser: bool) {
+fn add_collapsed_and_filtered(
+    node: &mut DeckTreeNode,
+    decks: &HashMap<DeckID, Deck>,
+    browser: bool,
+) {
     if let Some(deck) = decks.get(&DeckID(node.deck_id)) {
         node.collapsed = if browser {
             deck.common.browser_collapsed
         } else {
             deck.common.study_collapsed
         };
+        node.filtered = deck.is_filtered();
     }
     for child in &mut node.children {
-        add_collapsed(child, decks, browser);
+        add_collapsed_and_filtered(child, decks, browser);
     }
 }
 
@@ -201,7 +206,7 @@ impl Collection {
             .map(|d| (d.id, d))
             .collect();
 
-        add_collapsed(&mut tree, &decks_map, !counts);
+        add_collapsed_and_filtered(&mut tree, &decks_map, !counts);
         if self.default_deck_is_empty()? {
             hide_default_deck(&mut tree);
         }