As dbradf mentioned it the slew -Cancel- button is not reliable at all.
On my Eq6 pro-r, I always stay close to the mount when slewing in case it decide to skew until it bumps in the tripod legs. You can still press on -Cancel- but the slew will sometimes continue for a few seconds ( around 10 sec). That’s enough to crush your 2K€ camera on the tripod. It happened twice to me. The cam is ok but I won’t trust it anymore. Use -Cancel- and if it doesn’t stop it, just kill it using the mount’s switch. But you better stay close to it. The reason for this behavior is probably the ASIAIR PRO poor wifi that put some latency before your in-app actions arrives at the mount 🥱