You can't re-size this? I have a 2x3 widget that if I hold it like I am going to move it but actually just drop it gets a blue outline and then I can grab a corner and make it whatever size I want.
I have found the same problem, unfortunately. 4x2 is not gonna cut it, and there's no way to resize as far as I can tell. Ugh! Hopefully someone has a solution for us.
IIRC you have to download Google Calendar now from the play store. That was a Samsung move dating back to the Note 2. I don't ever remember calendar being on the phone over Samsung's version on all the notes. Maybe Samsung started doing that with the S-Series? Check the play store and see.
I downloaded "Calendar Widget" from Google Play. Works pretty much like the old 2x2 widget and you can make it as big or small as you want. Good luck!