Why Smart Launcher needs Accessibility for some gestures
Some gesture actions need Android Accessibility because standard app APIs cannot trigger those specific system interactions directly.
In Smart Launcher, Accessibility may be used for features like opening recent apps, expanding the notification panel, or running advanced gesture actions.
It is not a blanket permission to control everything. Smart Launcher uses it only for the actions you enable and within Android's security model.
If gestures stop working, first check that the Accessibility service is still enabled, then reboot the device if needed.