Trouble with installing OCLP on iMac with Bootcamp

I’ve got a 2017 iMac. I’ve had a bootcamp partition on the internal drive for ages. I installed Sonoma to a flash drive and everything with the OCLP app and when I restart, this is what I see. If I choose Install macOS Sonoma, no bueno. If I choose Windows with the weird OCLP icon, I get, well my Windows Bootcamp partition. If I choose Big Mac, I get standard old Ventura. What do I need to do to finish the OCLP install here?