GPT Actions creation GUI gone?

When adding Actions to a GPT, there was a gui (like buttons and fields) to set up how it’d be configured (GET vs POST etc).

But now theres just raw schema text to fill out.
Did the GUI flow disappear for everybody else too? I’m trying to switch from passing data via query paramater in the URL, to a more like a JSON object in the body, but I don’t know how to express that in the schema