Index: lldb/source/Core/IOHandlerCursesGUI.cpp
===================================================================
--- lldb/source/Core/IOHandlerCursesGUI.cpp
+++ lldb/source/Core/IOHandlerCursesGUI.cpp
@@ -5015,8 +5015,7 @@
 public:
   FrameTreeDelegate() : TreeDelegate() {
     FormatEntity::Parse(
-        "frame #${frame.index}: {${function.name}${function.pc-offset}}}",
-        m_format);
+        "#${frame.index}: {${function.name}${function.pc-offset}}}", m_format);
   }
 
   ~FrameTreeDelegate() override = default;
Index: lldb/test/API/commands/gui/expand-threads-tree/TestGuiExpandThreadsTree.py
===================================================================
--- lldb/test/API/commands/gui/expand-threads-tree/TestGuiExpandThreadsTree.py
+++ lldb/test/API/commands/gui/expand-threads-tree/TestGuiExpandThreadsTree.py
@@ -33,7 +33,7 @@
         self.child.expect_exact("Threads")
 
         # The thread running thread_start_routine should be expanded.
-        self.child.expect_exact("frame #0: break_here")
+        self.child.expect_exact("#0: break_here")
 
         # Exit GUI.
         self.child.send(escape_key)
@@ -47,7 +47,7 @@
         self.child.expect_exact("Threads")
 
         # The main thread should be expanded.
-        self.child.expect("frame #\d+: main")
+        self.child.expect("#\d+: main")
 
         # Quit the GUI
         self.child.send(escape_key)