In order to increase the left menu sections, you just need to customize the LeftMenuListLink file max-height. (Doc: Customize the admin panel)
In the example below, I will show you how to customize the max-height of the collection types section.
Thanks for the detailed instructions. I agree that max-height: 180px is a ridiculously small area and really needs to be increased (or removed altogether). I just wish your solution worked…
Unfortunately, the “admin/…” path you (and the docs) mentioned does not exist in my project root folder. There is “.cache/admin/…” with the same files, which I updated instead. However, this did not work.
I also tried creating the “admin/src/components/LeftMenu/LeftMenuLinkSection/” folder myself, but again, adding the updated files to this directory changes nothing on the frontend.
What am I doing wrong and how can I change this style rule?