Wait, what? There are ads in the OS? That's insane.
1) Geek Uninstaller [0] 2) O&O Shutup10 [1]
Both are free. Maybe there's better options now, but... They helped tremendously a short time ago.
[0] https://geekuninstaller.com/ [1] https://www.oo-software.com/en/shutup10