It gets locked after 5 minutes (or every time my laptop enters screen saver mode during breaks) and I need to enter the master password again and again.
I followed your instructions, yet the issue remain. Here comes the requested information:
Enpass version (desktop/laptop): 6.6.3 (836)
Firefox version: 89.0.2 (64-bit)
Enpass Firefox extension version: 6.6.2