J, if you want to be prompted for your password after you return from lunch then Sign Out of AxCrypt. I have put a screenshot below.
Obviously you’re compromising your security by not locking your screen because a malicious person could gain access to the system and implant spyware.
However, using the Sign Out feature will lock AxCrypt meaning your files cannot be viewed/decrypted until you Sign In again.
In AxCrypt 1 you would have to enter your password each time for each file even if you were sitting at your computer. AxCrypt 2 remembers your password until you Sign Out, lock your screen or restart your computer.