Menu items should be able to collapse and expand

[miroslavpojer]

Background

The current implementation presents the entire page and folder structure without any limits.
I agree with the warning not to create folder hierarchies deeper than 2, but we must present hundreds of features.

• We can split them into separate topics (folders), but there is still a problem with usability.

New feature proposal

• The feature to collapse all or selected menu nodes with sub-nodes would be helpful here.