The following menu items should list the primary shortcuts:
View | Code Folds | Collapse Folds (Ctrl+Subtract) or (Ctrl+Minus)
View | Code Folds | Expand Folds (Ctrl+Add) or (Ctrl+Plus)
View | Code Folds | Collapse All (Ctrl+Shift+Subtract) or (Ctrl+Shift+Minus)
View | Code Folds | Expand All (Ctrl+Shift+Add) or (Ctrl+Shift+Plus)
If all folds are expanded, the Expand All menu item should be disabled.
If all folds are collapsed, the Collapse All menu item should be disabled.
Not a big deal, especially Comment #1.
Created attachment 132540 [details]
Shows the current state in NB73
Works for me at least in NB 7.3. See screenshot