How to enable single vault for autofill, but all vaults for searching?

Hey theremin ,
Thanks for taking the time to write about this.

1Password will suggest autofilling items from every vault that is enabled (turned on) in the extension's settings page. The vault selector in the extension's window is there for filtering the extension's view, but will not affect the autofill suggestions, much like how the desktop app behaves - you can select a specific vault to view, but it will not ignore/hide results from other vaults unless you go into the app's settings and turn these other vaults off.

To clarify:
- The vault selector in the extension's window is for filtering the items list and search results in the extension's window only.
- The list of accounts and vaults in the extension's settings page (at the bottom) is to determine which accounts and vaults will actually be available and accessible in the extension and its autofilling functionality.

In your particular use case, I'd recommend you disable all vaults expect for the one you use most, and when you need anything from another vault, you can turn that vault on in the extension's settings on demand, then turn it back off when you're done.

Most users have all vaults enabled and find it quite comfortable. I have over 10 vaults myself and having suggestions from all is quite helpful. I can arrange the order in which these suggestions are showing up by marking the ones I use the most as favorites, which is another handy tip to get what you need quicker :)
In instances where I need to perform a screen share or a screen recording and I do not want some things to show up in it, I'll go to the extension's settings and turn off all vaults that I do not wish to reveal, then turn them back on when I'm done.

Turning off suggestions from specific vaults should not be as easy as it is to select a certain vault from the selector in the extension's window because that would cause some users (who are not as tech savvy as you) to accidentally turn off/select specific vaults and wonder where did their login items disappear to and why isn't 1Password working and suggesting autofilling on their websites. This feature needs clear separation to make sure users don't mistakenly limit their extension and lose access to their websites.

I hope that sheds some light on the extension's functions and their role.