A term I've heard since the ...2000's?...is "focus+context" [1], often used in visualisation. I'm looking for a very similar UI construct right now, for balancing simple high-level terms for non-technical people but digging in for people who want more detail, or who want a definition. My thinking is to have a sidebar with more info, but a closable popup might work better for mobile. Don't like popups but it's e.g. how iOS does "look up" when focusing on a word.
[1] And article hints at it with the lines "A fish eye lens doesn’t ask us to choose between focus and context" and "This concept isn’t new—it’s foundational to fields like data visualization."
[1] And article hints at it with the lines "A fish eye lens doesn’t ask us to choose between focus and context" and "This concept isn’t new—it’s foundational to fields like data visualization."