I second the request to for the IDE to remember the outlining. This is so important when project is large with many routines. I also Collapse All and then go and open "as required"... but can be tedious.
Even going back to the routine that was OPEN when you closed the IDE would be GREAT
I just realised (as is clearly stated in the Version 3.80 release note) that ALL of our wishes HAVE BEEN GRANTED !
Now bookmarks, breaks, outlining and tab order are all saved (in the meta file).
Note that Main is always the module in the first tab, and that the above parameters are not saved if they are the only changes made to a project unless you explicitly save the project before closing it.
All this information is now saved in the .meta file. If you are using a source control system then you should make sure not to include the meta file. Note that the project will be loaded correctly without the meta file.