Created attachment 182695 [details] Select protect sheet from tools menu In cell properties, there is the protection checkbox and the comment : "Protection will be effective only once sheet is protected : Select "Protect sheet from Tools menu". But there is no "Protect sheet" option in tools menu.
You are reporting for LibreOffice Online? Please also attach a screenshot of Tools menu.
Created attachment 182704 [details] Tool menu Yes, Libre Office Online.
[Automated Action] NeedInfo-To-Unconfirmed
This issue was recently fixed in Collabora Online which is the successor of LibreOffice Online https://github.com/CollaboraOnline/online/issues/551
I think this may be closed, per explanation.