Audio device sharing and cutting / splitting clips

Hi i am still quite new to Cubase and i am trying to get back into recording.

I have started recording my track and when i come to edit it, it will only let me drag the clip down / split it at a certain bar and not custom is there a way to change this?

Also when i have “release drives when program is in background” and i go to another program to listen to audio i have to keep restarting the other program to get the sound to work, why is this happening?