Keyboard shortcut in OpenOffice to incrementally increase or decrease font size?
Solution 1:
Go to Tools -> Customize -> Keyboard.
Choose "Format" from the column on bottom-left called "Category".
Choose "Increase Font" & "Reduce Font" from the bottom-middle column called "Function".
(Note that Ctrl++ is broken; you can't use the normal keyboard plus, you need to use the numpad plus, or another keyboard shortcut.)
Solution 2:
Althought not by default, you can assign a keyboard shortcut to this function.
Go to Tools Menu -> Customize -> Keyboard
Solution 3:
CTRL + [ and CTRL + ].