Return subsequent list based on true/false array

I have an array of true/false values in P15:49. In R15:49 corresponding items show if the value is true, are hidden if the value is false. I need to aggregate these selectively shown items into a subsequent list (no spaces in between rows) with a function....?

Welcome to the forum.

If you're OK to use a helper column (which can be hidden) then this is one way:
I'll use column S for the helper, so in cell S15 this: =IF(P15=TRUE,ROW(),"") and drag down to S49
In the cell where you want your list to start place this: =IF(COUNT($S$15:$S$49)>ROW(A1)-1,INDEX(R:R,MATCH(SMALL(S:S,ROW(A1)),S:S)),"")
and drag that down for 35 rows