Windows 11 Context menu glowing outline

If this doesn't help, the issue might be more specific to your registry customization. In that case, you could also consider resetting your Windows theme to a default one as a next troubleshooting step, but trying the transparency setting first is a simple and common fix.

Hi, when custom right-click submenus are added through the registry, visual glitches like that usually mean the shell is rendering a menu state it was not really designed to handle.

I would first export the registry keys you changed, then remove the custom submenu entries and add them back one at a time. That should show which entry causes the outline. Also check whether the command uses a legacy shell verb, a custom icon, or an invalid/empty `MUIVerb`, because those can make menu rendering odd.

There is not really a supported setting to style or remove that glow from a custom context menu item. If this is for regular use, the most reliable fix is to simplify the registry structure or use a supported shell extension/context menu implementation rather than forcing nested menu behavior entirely through registry edits.