In addition to the 1040, the drop down includes the EF Center and All Tax Returns. When I click on the latter two options all of the other tax return types appear. So I know the other return types are still somewhere in PS 2020. 

It's just trying to figure out how to get them to appear in the HomeBase View dropdown options.

Yes, it's weird why all tax returns other than 1040 disappeared in the view dropdown. Again, this happened after I created a client mailing list for 1040 clients.

Any other ideas on how I can solve this problem?

Thanks.