I am unable to create a signature for my emails.
I am unable to create or add a signature to my outgoing emails. When I select the Signatures popup, only an empty box appears. Also, when I go to Preferences, that same empty box appears with "Signatures" in the title bar.
I have an iMac Late 2017 5K, running Catalina in Dark Mode. The problem appeared when I upgraded to Catalina.
Thank you in advance for your suggestions.
iMac 27" 5K, macOS 10.15