I would love to have an option to group mail by label on my inbox dashboard. A bullet pointed list of the feature I have in mind:
- The feature does not have to be available on mobile and could be a web exclusive (as is the case with Google Mail)
- The feature can be toggled on/off on the settings tab, next to density and layout
- Each label would be turned into a separate list of mail items
- If an email has multiple labels, the email would appear in both label's list
- All unlabeled items would be displayed at the top, in a list named "Inbox" for example
- If an item from the "Inbox" general list receives a label, it will be teleported to the corresponding label list
- Lists can be collapsible (ie accordion), allowing the user to hide currently irrelevant emails by label

The motivation behind this feature:
Allows people to organize their emails in a folder-like way, but also have a quick overview of everything that's going on without clicking through multiple views.

Illustrative picture of what I have in mind, using Google Mail as a blurred out example:
https://imgur.com/a/XRRRz5D