idunk - thanks again - your suggestion works.
Mili - your scenarios are correct, but here are two where "encrypt filenames" is not available, though it should be.
Create a new 7ZIP empty archive, without encryption.
Drag a file into the window, the attached popup appears. Select encrypt - filename option not available.
Create a 7ZIP unencrypted file with some content (a single file) or open an existing 7ZIP file.
Select Encrypt from Tools menu. Attached pops up - select 7ZIP, Encrypt AES - filename option again not available. This is the more common situation for me where I want to simply encrypt some archives and not others, that have been previously created.
