Find required action and change key sequence to the required one (e.g. remove current and add new one .. or just add new one if you want to have 2 different sequences).
P.S.
You can search for required action by it's name .. or by keyboard shortcut (button next to search field)
Ctr+Space by default assigned to "Code | Completion | Basic"
If you cannot change/add new shortcut, then you ust be trying to edit bundled keymap. In such case create ("copy" button) your own and the you will be able to alter it.
Hi there,
Settings (Preferences on Mac) | Keymap
Find required action and change key sequence to the required one (e.g. remove current and add new one .. or just add new one if you want to have 2 different sequences).
P.S.