[Feature request] Delimit max height extension of reading mode settings window

[Palloxin]

Describe your suggested feature

When on fullscreen there is a problem with the settings window of reading mode:

I would like it to not overlap with the system upper line.

It should probably look like this:

Other details

With Fullscreen turned off it's even worse:

Acknowledgements

• I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open or closed issue.
• I have written a short but informative title.
• If this is an issue with a source, I should be opening an issue in the sources repository.
• I have updated the app to version 2.0.0.
• I will fill out all of the requested information in this form.