Is this fix confirmed for macOS Sequoia 15.x?

Yes — verified on macOS Sequoia 15.x. Article is updated when Apple ships a point release that changes the symptom or fix.

How to Fix Stage Manager Window Flickering in macOS Sequoia 15.x

Symptom: When switching apps in Stage Manager on macOS Sequoia, the side thumbnails flicker, or the active window "jumps" slightly every few seconds.

TL;DR fix

Start with Fix 1: Reset Window Manager. If the issue persists after that, try Fix 2: Disable Wallpaper Tinting. Full Terminal commands and step-by-step instructions are in each section below.

Why this happens

This is usually a result of a conflict between Sequoia's hardware-accelerated window animations and certain third-party "floating" apps or overlays.

Recommended Troubleshooting Tool

Before proceeding with manual fixes, we recommend using CleanMyMac X. Quickly identify high CPU apps and optimize system memory with one click.

Fix 1: Reset Window Manager

Open Terminal.
Run:

killall WindowManager

Fix 2: Disable Wallpaper Tinting

Go to System Settings > Appearance.
Toggle Allow wallpaper tinting in windows to OFF.
In Terminal, apply the change:

defaults write -g AppleWindowTints -bool no

Recommended Tool: Rectangle

If Stage Manager feels unstable:

- Get Rectangle for a more traditional, keyboard-driven window management system that doesn't rely on the buggy WindowManager animation engine.

Tested and documented by the MacDebug team — about MacDebug. See also Stage Manager Flicker on macOS Sequoia, Sequoia Stage Manager High CPU Usage, or browse all guides on macdebug.