diff --git a/CODEX.md b/CODEX.md
index b28423a..14f77c6 100644
--- a/CODEX.md
+++ b/CODEX.md
@@ -165,6 +165,7 @@ Use the repository rule file as the project-level source of truth for coding-age
 - Read relevant code and docs before editing.
 - Check `git status --short` before edits.
 - Treat existing uncommitted changes as user work; do not revert them unless explicitly requested.
+- Unless the user explicitly asks for direct code or file changes, first explain the proposed approach and wait for the user to decide whether to execute, continue, revise, or stop.
 - Before writing files, explain the goal understanding, files to touch, implementation plan, risks, and validation path, then wait for user confirmation.
 - Skip the confirmation gate only when the user's current request clearly authorizes direct modification, such as "可以直接修改", "无需确认", "直接执行", or equivalent wording.
 - Keep edits small and task-scoped.
diff --git a/xr_rm_bringup/tools/launcher_ui.py b/xr_rm_bringup/tools/launcher_ui.py
index cca5d86..314ed24 100755
--- a/xr_rm_bringup/tools/launcher_ui.py
+++ b/xr_rm_bringup/tools/launcher_ui.py
@@ -35,6 +35,7 @@ SAMPLE_SENDER_SECONDS = "30"
 SAMPLE_SENDER_STAGGERED_SECONDS = "60"
 XROBOTOOLKIT_BRIDGE_HZ = "90"
 XROBOTOOLKIT_BRIDGE_EXECUTABLE = "xrobotoolkit_to_udp_bridge"
+TERMINAL_SCROLLBACK_LINES = 2000
 SAMPLE_SENDER_ARGS = (
     f"--host 127.0.0.1 --port {DEFAULT_PORT} "
     "--pattern axis_sweep --amplitude 0.5 "
@@ -1062,7 +1063,8 @@ class LauncherApp:
             "[keybindings]",
             "[profiles]",
             "  [[default]]",
-            "    scrollback_infinite = True",
+            "    scrollback_infinite = False",
+            f"    scrollback_lines = {TERMINAL_SCROLLBACK_LINES}",
             "[layouts]",
             f"  [[{layout_name}]]",
             "    [[[window0]]]",
@@ -1117,7 +1119,8 @@ class LauncherApp:
             "[keybindings]",
             "[profiles]",
             "  [[default]]",
-            "    scrollback_infinite = True",
+            "    scrollback_infinite = False",
+            f"    scrollback_lines = {TERMINAL_SCROLLBACK_LINES}",
             "[layouts]",
             f"  [[{layout_name}]]",
             "    [[[window0]]]",