>>7947820>A lot of Zeta figures don't have that option?Nope. Most Zeta figures/kits have the shield mounted on the back of the arm (aka "gorilla arm" syndrome) with no option to switch it to the side. Some people have complained about this issue on the ANIME Cold Districts GM as well.
It's one of the niggling quirks of 80s robot design that for some reason Bandai rarely offers the option to change. It's really as simple as including an alternate adapter piece that clips to the arm.