By the way, ASIAIR Betas do not include update logs. The only information is in the TestFlight page that describes what a beta tester is supposed to focus on:
The "soft restart" is in the popup menu when you click on the red power icon at the top right corner of the ASIAIR Settings window. There is now a "Restart" button in that popup (similar to MacOS "Restart/Shutdown").
This can actually be useful for me because right now, my telescope's eero mesh router is in the same waterproof box as my ASIAIR, and powered from a common 12V supply that is indoors. When I reboot the ASIAIR by toggling the power supply, that also reboots the router (takes forever to boot and properly join the mesh). With this new function, I should be able to reboot the ASIAIR without affecting the router.