Many YNAB users love the ability to connect to their bank accounts and have their transactions imported and many, many YNABsters use that feature. [I have serious reservations about using this function but that’s a post for another day.]
Weirdly, YNAB doesn’t have an indicator on the budget screen prompting you to do your thing.
Toolkit for YNAB fixes this oversight by offering the Show Import Notifications in Navigation Sidebar setting. With this setting turned on, any account with waiting imports will be easily identified by an underlined account name.
This setting lets you choose between red or white underlining.