This isn't enough for me to not want to use the native proton calendar app and not have to rely on a browser-based solution. It would be really nice though, and I'm sure the development is already well aware and is doing great things, just as they always do (10 minutes of free uploads the first time you open proton drive is genius!).

I personally think that the users would be happy with an interim solution that allows for wider cells when in vertical mode, which is perhaps inelegant, but would be a good testing ground for different implementations of cell size for the eventual release of horizontal mode.

I think it would be worth considering creating an optional format within the month mode that displays each week as 2 rows, and the user would be able to scroll down to view the weeks of the month that won't fit on the screen.

7 days could be fit into 2 rows by: having 4 columns of 2 rows, with a one cell being composed of info about or user notes on that week OR have one row contain only 3 columns (my preference being making Saturday and Sunday be 50% wider than the other days' cells) OR have one row consist of 3 cells that are all 33% wider than the other 4 days of that week.

Another option is to use the web page through your internet braowser to access your calendar.

I am using an Android tablet and have the same issue with lanscape mode not working for the calendar. I was able to temporaily fix this problem until it can be fixed natively. I installed an app called "Force Rotation." When I open the calendar, it momentarily populates in portait mode and then switches to landscape. Hope this helps others until Proton can fix it internally.

It's very frustrating to discover basic functionality missing when I've purchased a year's subscription. Fine you could argue that I should have checked before spending my money, but this is basic stuff. Please add it, I would love to continue using Proton.