Tag search for messages to archive

Hello,

my apologies if this has already been brought up, as I imagine it has – I would like to be able to attach quickly a label (tag) to my new messages, by doing a search through my labels (as I can do within gmail), as opposed to scrolling through all of them, which can be fairly slow. I am sorry if this already exists, I haven’t been able to find it.
If it doesn’t exist, I think it would be very useful.
Thank you.

Once you have done the search, select all the messages in the list using Ctrl + A. You can then tag them all by right-click > Tag.