In pretty much every gaming console that has an "A"/"B" config, "A" is "confirm" and "B" is "back". Universally. It takes all of a few minutes for anybody to catch onto that, and they stay caught on.
The Playstation doesn't have a universal setup like that. The "shapes" can't make perfect sense to you because they don't have a way that makes sense. Sony doesn't even have a uniform way they use them!
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