To disable the Roblox desktop app on Windows 11/10, you need to use parental control or application control software. Program Blocker by TheWindowsClub is a great free app to block the Roblox app.

Now, with the Add or Remove Apps window open, find that same Desktop app you’d like to remove or uninstall in Windows 8.1. Click on it and then click on Uninstall in the top toolbar in the window.