Notice That Excel in-built security function isn't very potent and you can simply open up worksheets/workbooks which have been locked. Even so, if you'd like to promptly protect it just before sending it to your supervisor/client (so they don’t wind up changing anything at all by oversight), it works properly. https://forbesworlds.com/onedrive-vs-google-meet-training-which-one-is-right-for-your-team/