Thank you all! The solution presented in the link worked for me.
Copy the folder
/usr/share/cinnamon/applets/menu@cinnamon.org
to~/.local/share/cinnamon/applets/menu@cinnamon.org
In the local copy open
~/.local/share/cinnamon/applets/menu@cinnamon.org/applet.js
in a text editor.Navigate to line 32
const MAX_BUTTON_WIDTH = "max-width: 20em;";
and reduce the value of 20 (10 works good).
In my file it was on line 30.
I’ll mark post #2 as solution (sorry @ricklinux! @alenbasic was first. )