Is the Help Browser limited to showing only six panels? or is this a limitation of one's desktop environment?

I'm considering switching from pd-tutorial to using the else library for teaching Pd fundamentals, but the else library has directories like

else/Live-Electronics-Tutorial/Part.01-The.Basics/01-Pd.Quickstart/2.Syntax/3.Send-Receive/

and then my Help Browser won't show the contents of the next directory. I'm using Pop_OS whose COSMIC desktop is based on Gnome.

Thanks for any suggestions. I really want to make this really easy for the students.

Sam