I have a large projects file with many nested projects. All projects are unfolded. Now I position the cursor on a top level project and hit successively “Shift + Cmd + 9” (which will trigger the menu “Collapse all by level”). Normally this would collapse the leafes of the outline successively, every time I hit that key combination, until my outline is completely collapsed.
This worked every time I used it, and it still works in all my other project files, but not in the large one anymore.
I checked my projects file with other text editors. All indents are tabs. So correctly formated.
Does anybody have an explanation why I cannot use that command in this particular file anymore?
To be more specific: Items up to level 3 are successively folded by successive hits of the key combination. But then folding stops there.