How to show a list of only the Inboxes as in Favoutites in Outlook MS standalone app

How can I duplicate below in TB / BetterBird ? We all know and see from left side of TB / BettreBird open app screen is the list of email accounts one has. In Outlook 2016 and onwards one can add just the Inbox of each mail account I have to a list called 'Favourites' and this resides above all the mail accounts and displays as a list of all the 'Inboxes' only. This means I just have to click on each respective inbox an it displays just that....all the mails in the Inbox. Currently I just have the list of account names where, when a mail is received and the corresponding circled number of mails shown I have to open the account to see the drop down then select the Inbox to get to the list of emails. I am sure I am missing the solution. Thanks for assistance.