It started when i took a new computer. I downloaded adobe cloud, signed, installed Illustrator and this problem appeared.
Interesting thing is, that on my other computer there is no such problem, everything works fine.
I just restarted this computer but nothing changed.
Without knowing how many pixels you are displaying my reply may be quite lengthy.
Looks like you don't have enough room at the top, as there is no free space.

You could turn off some of the those options by unchecking items showng here

but would recommend instead to show more pixels and that should clear up
Start > Settings > System > Display
Make the font smaller and choose resolution with most pixels

or try changing here
