Changing the default option for encrypted USB drives

[Adam Funk]

I have some LUKS-encrypted USB drives. Whenever I plug them in, I get
a dialog asking for the passphrase with three options below the text
field:

* Forget password immediately
* Remember password until you log out
* Remember forever

The second one (until you log out) is always the default. Is there a
way to change it so that "forget immediately" is the default?

If I use the second option, is there a way to clear the passphrase
manually without having to log out?

If I accidentally use the third option, where is it stored and how can
I clear it manually?

(Ubuntu-MATE 22.04 LTS, but this has been bugging me for years on
previous versions.)

Thanks