Why am I in Sandboxes without an option to return to Test Mode?

I returned to my old Stripe account after a year or so and now my new application/integration is stuck in this new thing called Sandboxes. As far as I can tell, there are no videos explaining how to use it.

I managed to do my testing ok, but now I’m ready to deploy (from Bubble.io) and discovered that there’s no way that I can find to copy my webhooks, products or payment links to Live. While before all you have to do was to flick the switch on the top right, now I have to redo them all because none of the “copy to live” functions work.

Again, why am I forced to use a “private beta” version without asking? Apologies but I’m not a developer…