Unfortunately, it's still bad. It's a bit better than dragging the handles of the selected area, but if I go to far and want to reduce the selected area, it doesn't work anymore.
Apple actually finally managed to allow 0 minutes as a time limit. Screen Time really needs to be finished by Apple, with a few more features, like more allowing certain apps at certain times (not just disallowing one set of apps at a certain time).
Many people here are mentioning alternatives. The ones I’m using are mailbox.org (although they recently raised prices for new customers) and uberspace.de (includes ssh access).