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Where is "set variable" and "show output" gone in niagara?

Just started with niagara following a tutorial from last year: Intro to Unreal's Niagara System - YouTube, things seems to be moved around quite a bit in niagara.
I am curious where is the “set variable option gone” also, when I clicked on the eye icon (i.e.show option), there is no “show output” but “show parameter read”, “show parameter write”. So I am just wonder where they have gone? Thx!