Press print where?

Do you have any printing add-ons installed? My understanding is Thunderbird has no direct print option in recent versions, only print preview with has a print button.

When you click on an email to view it a strip appears with a delete button. That's what I use. And no, I do not have any printing add-ons installed. Printing has been working fine up to a couple of weeks ago and I did not make any changes in settings or anywhere else. (It just suddenly would no longer print an email

Still can't print emails. Are there print settings somewhere?

At the bottom of the Help/Troubleshooting Info tab there is a button to clear saved print settings. Try that and restart TB, and see if the print dialog appears.