I also referred to this type of problem here: Sub-Documents in Sub-Mindmaps
A good way to tackle this problem would be, to whether implement a “page”-view for tabs. Like you have 55 Documents → 11 Documents/page → 5 Pages.
Another (i would prefer that) solution would be, to give the user the option to hide some documents. Following scenario:
I have 50 Documents imported but I just want to study 3 right now
- In the option “Manage” i could set an extra toggle for “focusing” on specific documents.
- After I set that checkbox for the 3 Documents, only 3 are shown in the tab-bar, but the rest would remain imported in the mind-map.