Outlook 2016 Data File Won't Delete From Home Screen

I need help guys. I tried to IMAP my work email profile to Outlook 2016 but apparently I had an old .pst file in the outlook data folder. so it said "the path is too long". The outlook system created a new .ost file idential to the .pst file and now I cant delete the email from the home screen in Outlook 2016. My issue is that it's showing up on the home screen but not the email account list. How can I delete a data file from the data file folder when it's not showing up in the email account list? See the screen shot attachments so you know what I am talking about. Any help on this please!!!

 

Loads of ways to do this but I would use Wise Care 365, a free maintenance program with many useful features, one being Force Delete. You only need to know the file location, which is given in one of your helpful screenshots.