Bulk/Select All for Adding to Folder in UI

Hello - Thanks for providing a way for users to suggest QoL and UX/UI updates.  I did some searching and can't find a previous post that matches the below suggestion so apologies in advance if this is a duplicate request.

Current State:

I'm in the process of adding thousands of cards to my collection and the way I'm doing it is box-by-box so I'm creating folders for each box.  For example, "Large Baseball Box #1."  After I'm done adding all the cards from that box into my collection, I then have to go to my collection, view all items NOT in a folder, then manually click the drop-down and select "Large Baseball Box #1" for each item, which is tedious and time consuming.

Proposed Solution:

It would be fantastic if there was an option to "Select All" once I'm looking at the list of things NOT in a folder, click a single drop-down, select the folder called "Large Baseball Box #1", then click an "Update Selected" button and everything is moved to that folder.  Not including scrolling down, for a list of 250 cards, this will bring the number of clicks I need to perform down from 500 (2 clicks per item (drop-down and folder select)) to 4 (select all, drop-down, folder, update), a savings of 496 clicks or a 99.2% reduction in clicks.  The time/click savings is exponential.  500 cards = 1,000 clicks currently. With this system is would save 996 clicks or a 99.6% reduction.  Etc.

Thanks for reading.  Keep up the good work!