It’s just a patch in the Manager. You may need to download the free version APK from somewhere like APKMirror and patch that though (you can also disable ads so it’s like the Pro version), as there don’t seem to be any Pro APKs and you can’t patch an installed app without root.
I’m currently using a Mi Band 6 (with a nylon strap that’s real comfy), but I wish the Pebble still existed. The e-paper display, the nice UI and tactile buttons, with good battery life and the ability to make apps was great.
Once my Mi Band breaks, I’m torn between Garmin (since they check almost all of the Pebble boxes, even if I don’t do fitness and they’re more fitness oriented) and a Galaxy Watch with the rotating bezel, since that was really cool to play with, plus the Android integration might be nicer.