i have the same problems. you can try the below, but they never worked for me.
1, run CA as admin
2, match the CA in game resolution to the resolution of you're desktop
3, use windows task manager to press switch to/from
4. windowed mode(windowed mode doesn't work if you have this problem it makes CA open in the task bar, which puts you where you were before)
as i said, none of this worked for me, but you can try them.