Minecraft buggt on fullscreen?

I have just finished resetting my PC and now I wanted to download all the games / apps that I had before. However, every time I start minecraft and set it to full screen resolution 600 x 400 or 1 higher, the screen is small and buggy rum How can I manage that when I start minecraft with 600 x 400 that can be seen in the full screen

Latest Graka driver installed?

I try it thanks for the answer.

Just install and if it still works then reinstall Minecraft.

You have to make full screen in the graphics settings