Hi I'm learning PPDEditor and wonder how do you place the button next to another and how to have the L and R arrows on hold?

Hi!
About your first question, I'm not very sure...
But, if you want to make a "hold" arrow, you need to do this:
First: Place a beggining arrow (when the hold starts) and then an ending arrow (when the hold ends).
Second: Select the two arrows
Third: Press Ctrl + F...and there you have! (^-^)