Hello DivMizrahi,
First of all, you need to check that if it's installed as an App. Open Microsoft Edge, click the 3 Dots in the Up Right Corner. Now, Hover 'Apps' in the middle of the Popup Menu. If you have already installed it. It is shown in this way;
To uninstall it, open the Start Menu, find YouTube, Right-click it. In the Popup Menu, click Uninstall...!
I hope it will work...!
Kind Regards,
Desandu Hettiarachchi,
A Member of WindowsBB