To get a better / clear understanding in which vault a record is, it would be very usefull that if you have selected All items in the web app, that it shows in which vault a record exist. I just moved to ProtonPass, and its confusing to select items / select vaults to see in which vault a record is.

Maybe a simple solution to this:

In All items:
Show a badge at the right side of a record (badge outline could be the color of the vault) with the name of the records vault.

Screenshot: https://i.imgur.com/XfJTpj2.png

And maybe this can be enabled / disabled in the overview settings.