Text in editor mode too small to read

[Mvin]

Hi, I am using the latest versions of the PRO plugin.
The problem is that in the text editor the text is too small to read (right part of the screen).
On the left side it is readable.

What I tried to do to solve it:
-deleted all custom css lines
-change the theme to astra and generatepress -> no fix
-disabled all plugins except the elementor plugins -> no fix
-regenerated the css (inside elementor settings->extra) -> no fix
-synchronised library -> no fix

Does somebody has a clue how to fix this issue?

This problem is only visible in the editor, not on the frontend.