According to https://docs.sublimetext.io/reference/keyboard_shortcuts_osx.html, it should be Command+Ctrl+Up.
- ⌘ = Command
- ⇧ = Shift
- ⌥ = Option (a.k.a. Alt)
- ⌃ = Ctrl
- ⎋ = Esc
- ↩︎ = Return
- ⌫ = Delete (a.k.a. Backspace)
See also https://apple.stackexchange.com/questions/42615/is-there-a-list-of-menu-shortcut-icons for the meaning of the symbols.