Hello 
Finally to handle this I’ve created a quick message panel modal which can trigger with a header icon.
I’ve rebuild the notifications on user menu header icon with removing the PM green notification and switched it with count notification because the PM notification is blocking the others blue (count) and now we show the unread message notifications on the message header icon same like chat blue bubble. So the other user menu notifications can count correctly.
The message panel is opening in a modal. This contains the inboxes, navigation and messages. Message title, participants, excerpt, thumbnail and the bottom part is the latest post date, replies, reactions and views count.
The modal footer contains two buttons: new private message and all (to go to the messages page).
Desktop
Mobile (it placed in the bottom bar)
