If you use the Winaero Tweaker app, a Reddit user, RemarkableOil451, has put out a warning about using the software on Windows 11 over dangerous Reset to Defaults settings that can cause system corruption on Microsoft's newest OS. According to the Redditor, pressing the "Reset this page to defaults" button in the Advanced Appearance module executes an immediate, persistent registry write without asking the user for confirmation.
The reset function in Winaero Tweaker injects legacy binary values (static 9pt Segoe UI) into the Windows 11 Registry Keys. This legacy data conflicts with Windows 11's native Accessibility subsystem by overriding the Text Size scaling and rendering the UI illegible on high-DPI displays.
If you manage to muck up your system settings, the Redditor reports that manually deleting the injected registry values does not fully resolve the issue, with the font face bring broken entirely, forcing a system-wide fallback to Arial. While unconfirmed, the Redditor thinks that the app might inject hidden dependencies elsewhere, perhaps FontSubstitutes, that survive cleanup.