Quick answer
Install and safely restore a Codex Desktop theme on Windows without changing WindowsApps ownership or package signatures.
Keep the Microsoft Store package intact
A safe Windows theme discovers and launches the current Codex package in its normal context. Do not take ownership of WindowsApps or replace packaged files.
Use the supplied launcher
Close Codex if requested, run the theme installer, and use the new themed launcher. The visual connection should bind to 127.0.0.1 only and stop when you restore the stock appearance.
Test maximized and narrow states
Windows compositor behavior can differ across hardware. Verify normal, maximized, and narrow windows before keeping a visual theme enabled for daily work.
Compatibility note: Native Codex appearance controls and advanced visual image layers are different. Get Codex Theme labels the delivery path and never treats an experimental visual layer as an official Appearance feature.