Thx for the quick response @Jeff_Hager !
The app is new, so no compatibility issues there.
And well, I tried duplicating my project to test row count: I deleted all screens that were using other sheets and left just the 4 that use the same sheet (and show different filtered versions of it), but my usage is 475/500 even though the only sheet being referenced has just 172 rows.
What am I missing here? 