Flagged Mailbox no longer showing in sidebar for all mail/google and iCloud

I had a folder on the side bar that says flagged and all my flagged emails automatically went there. it is still on my phone but on my Mac there is nothing of the sort anymore. Ive tried all the hacks here but nothing seems to work. I still do not see anything under inbox/drafts/sent/junk/trash and archive!

Help!!!??