You cannot view the contents of a letter of recommendation submitted in StandOut Admissions Network.
Even if you have not waived your FERPA rights to view the letter, it is still not possible to view.
A recommendation in StandOut Admissions Network is not part of your academic record, therefore is not covered under FERPA.
If you later are admitted to a College, the letter MAY become part of your academic record. Under FERPA, you could request it then, from the College you are attending, if you have not waived your right to view it.