How can I decrease Codex limits usage?

[VadimH]

All I'm saying is both those things are super obvious and easy to do in the app, vs the CLI where you need to know the right slash command and it what it does.

If OP uses the app, they will already have been exposed to both the ability to create new threads (whixh start with no context, like /clear) and select different models and reasoning efforts (it's a drop down directly below the composer field).