Hi @Mike P,
Exactly; that was the problem. I only saw "add more"; when clicking there, only a few pre-defined templates were available, but not my templates nor the former gallery. I am using the past tense because this morning, a new update has appeared when launching Evernote desktop:
10.61.5-win-ddl-public (20230831054637)
Editor: v176.8.0
Service: v1.72.10
© 2019 - 2023 Evernote Corporation. All rights reserved
Once updated, the problem has been solved and now i can see the bouton "...Open Gallery" with all my templates there.
I am really grateful to the Evernote team for having solved this so quickly.