Problems with small size of interface in Musescore 3

Hi
I have problems icons of MuseScores 3 interface.
Everything in the toolbar is so small that I can't see them and in the Palette all the icons are big. I use my 42 inch tv as my screen.
I have to set the score to 350 % to make the score a proper size.
I had the same probleme with MuseScore 2, but I can't fix it the same way.
Please help me.

Regards Nanna