The sublevels of the tree can be made hidden, and they can be revealed when clicking on a specific parent. And if the user expands the tree to a large size, then it is worth limiting the maximum size of the panel and showing a vertical scroll when the maximum is reached.

@aklapper we are talking specifically about documents that are under another document, that is, about the hierarchy of pages in the wiki.
The screenshot F3250825 just shows that the visualization of the document hierarchy is not very convenient in my opinion, and I ask if it can be moved to the side.

Changed the policy for file F3250825 to Public.

Good afternoon!
I get it, if you go to Phriction > Welcome to the Forge Wiki, then the hierarchy of documents will be displayed at the bottom (the screenshot below is attached). You won't see this in your example, as there are no attached documents.