Change your handle over to the other side. It will facilitate your right hand to better actuate the press
My powder measure can also be mounted on either side of the stand. I kinda wanna lean to it being on the right. But that area also works for the tumbler. That being said I guess the tumbler can be down on the bottom shelf. Doesn't need to be up there. It's hard to see loading the press with my right hand. Being I want to operate it with my right.I have my powder dispenser as well as a powder measure for pistol and other thrown charge cartridges(my 35 rem n 30-30) on the right edge. I have my press next. This allows my loading block to tne on the left of the press. I can swap out to a lube pad then the loading block to the left. Brass prep is not close to the press area for me. Sit or stand there and go through the motions and you will figure out how you work from an ergonomic perspective.
If your working right handed you can load the next case with the left hand if the cases are on the left side other wise your slowing down releasing the press arm to grab a case. If your working left handed the opposite would be better. Other wise to use your off hand your reaching over yourself. Not very efficient or comfortable.
If you're a visual/audio learner: