Look of Musescore

Hello,

My problem is, I tried to install some Soundfonts on my Musescore (last version) and I didn't notice it was some .sf2 and not .sf3 . And then all the style of the interface has changed and lot of things are not like before. I want to go back and just have Musescore like I was used to have it, what shall I do ? I tried to delete all the files I downloaded, and delete and reinstall Musescore but it stay the same version I don't know of Musescore...

I hope you'll be able to help me thank you very much !!