Some essays may only pop up after you declare your major and/or if you are applying for named scholarships. I remember that Rice, in particular, didn’t list all of its supplemental essays on the Common App – they only came up after you specified your area of academic interest.
We found the website College Essay Organizer particularly useful – it provided a tool for looking and organizing ALL of the essays for ALL of the schools, including scholarship applications.
@BusyMomofSons - I wasn’t able to find the Grinnell video on Youtube (I did see something from the Today Show from 2014 when Seth Allen – now Dean of Admissions and Financial Aid at Pomona – was still at Grinnell), but I did see a roundtable from Amherst that was interesting. Interesting note: when D applied to Grinnell for the class or 2021 (2017 HS grad) there were no supplemental essays, until there were. She got a request for a “Why Grinnell?” essay about one month after submitting her CA.