Have a password and viewing only option for online documents like libreoffice in Proton's documents: to avoid mis editing when viewing specific files.

I believe the ability to password protect sheets and/or individual tabs is essential. For me, it is another layer of privacy and data protection as I use sheets to manage personal information. This password would be required to open the sheet in browser, download it, view it when shared, and so on.

With G sheets, a locked document loses its password when downloaded, so I assume a similar issue would happen with Proton sheets. That is why I believe its important to require the password for that sheet in order to download it from the drive.

This would be huge, I mean encryption and stuff is nice, but if I forget my drive open and someone gains access to it it's useless. Some files should not let you modifiy, read, write, delete, download, unless you provide your password for that file.

This would be incredibly useful, i would really be interested and even willing to pay to password protect proton docs, sheets and any other documents and folders within my proton drive. A really useful feature. Please please please!