Gmail blue bar (/current conversation indicator) not following clicks

Question

Generally, the Gmail blue bar indicator or selector for keyboard shortcuts follows a click on the conversation's selection box. For some reason, it's stopped doing that in one of my accounts. This is very frustrating as I use keyboard shortcuts often, mostly around conversations that I interact with.

The GIF below illustrates one of my healthy accounts:

This one is the account with the blue bar not following selection clicks. Note that keyboard shortcuts are activated, as evidenced by the fact that I use them during the screen recording here:

Any pointers on what might be happening?

Answer 1

The "Multiple Inboxes" advanced setting covered in this Google help article has the side-effect of disabling the usual blue bar behaviour.

Disable the Gmail/G Suite advanced option of Multiple Inboxes to make sure the blue bar follows the latest click, as expected.