New to HP prime

[std]

Hello people,
I recently bought my HP-prime and I think it is a great calculator.
Before I ask a few questions I would like to mention that the keys are harder to press, compared to other keyboards and the orange colour for the letters makes it a little difficult to focus my eyes on. Maybe a dark red colour would be more appropriate.
Anyway, I have some questions
1) According to the latest manual, on page 514, "An attempt to store an element to a row or column beyond the size of the matrix results in resizing the matrix to allow the storage. Any intermediate cells will be filled with zeroes." but it only works on Home view, not in CAS mode. Why is that?
2) How to clear all the variables at once? I mean real, matrices from HOME tab and all the user variables?
3) In CAS settings, the number format setting doesn't seem to make any difference. Am I missing something? I also cannot find out what does the number next to it mean.
4) Is it possible to make multiple statements, like L1:=L2:=1 ?