So the factbook side pane width doesn't work.
There are so many sub folders (and they are all indented) that it pushes them to the right into not being readable. To make it readable I would have to widen the pane to like a third of my entire screen.
There are several ways to fix this. You don't really need to indent subfolders. You could do colors instead (and/or bolding, different fonts etc.). Colored text or colored background sections. Or shade banding, where one section is darker then the next and the shading alternates.
You could have two panes, one above, the other below. The top pane could be main parent folders the bottom could be subfolders; a type of "results list".
You could give it a horizontal scroll bar. My file manager has that.
If you were to give it that scrollbar it would be nice if it would auto-push to the right (keep the current subfolder horizontally adjusted / justified).
Could you please give the side panes an auto width. Table of contents, factbook etc. It would take the weighted average of the list of items and auto-set the width to make 80% of them show their entire text. The longer items would be truncated. With a button at the top with a drop down, with some width options: Default, user default (we would set out desired default width) and auto (it would read text length and set it to average = 80% width).
Can you please give the side panes an auto-follow. It would collapse all expandable subfolders, and just have the current folder open, and auto-scrolled so that entry is at the top of the view (not locked to, but auto-scrolled to). We could pin folders if we want to keep them open, or turn off auto-follow (with a button, hotkey etc.). It would be nice to have both session pins and permanent pins. I can think of the majority of all modern software incorporates these side pane features; Logos is the odd one that doesn't.