diff --git a/src/routes/events/[event_id]/(launcher)/launcher_file_cont.svelte b/src/routes/events/[event_id]/(launcher)/launcher_file_cont.svelte
index 05f1a1e4..00be4aa4 100644
--- a/src/routes/events/[event_id]/(launcher)/launcher_file_cont.svelte
+++ b/src/routes/events/[event_id]/(launcher)/launcher_file_cont.svelte
@@ -737,11 +737,10 @@ function prevent_default<T extends Event>(fn: (event: T) => void) {
                 type="button"
                 onclick={async () => {
                     const cur = event_file_obj?.cfg_json?.display_override ?? null;
-                    let next: string | null;
-                    if (!cur) next = 'extend';
-                    else if (cur === 'extend') next = 'mirror';
-                    else next = null;
+                    const next: string | null = !cur ? 'extend' : cur === 'extend' ? 'mirror' : null;
                     const new_cfg = { ...(event_file_obj.cfg_json ?? {}), display_override: next };
+                    // Optimistic update — don't wait for the liveQuery round-trip
+                    event_file_obj = { ...event_file_obj, cfg_json: new_cfg };
                     await api.update_ae_obj({
                         api_cfg: $ae_api,
                         obj_type: 'event_file',