Can a congregant who opened the Aron Hakodesh walk in front of the open ark and walk to the other side of the platform where the Aron is situated?
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My sense is it's just a matter of respect for the visibility of the open Aron; if all the congregants are looking at the Torah scrolls, you don't want to appear like you're hogging the attention and blocking their view.
If for whatever reason you need to be on the other side, I'd say just cross over as quickly and as unobtrusively as possible.
That's just my gut sense on the matter.