You can set an inactivity timer, and if you have a screen saver you’ll also have to enter the password after it has been activated.
If you *ever* leave your computer signed in an untrusted environment, there are no longer any guarantees about anything. It doesn’t matter how AxCrypt operates in this case.
Take as a an absolute routine to never leave your computer without locking the screen first.
Please read https://www.axcrypt.net/blog/leaving-computer-axcrypt/ for a longer discussion about this.