Depending on your device and keyboard settings, you may need to use the Fn key together with the designated shortcut to open the ONMO+ side menu:

• Windows: Some PCs require you to press Fn + F1 (or the relevant function key) instead of F1 alone.
• Mac: On many Mac devices, function keys (F1–F12) act as media/system keys by default. Press Fn + F1 to use them as standard function keys, or change this in System Settings > Keyboard.