You could follow the steps below to enable auto-tracking via the Reolink App.
Applies to: RLC-523WA, RLC-81PA, RLC-823 Series (RLC-823A, RLC-823A 16X, RLC-823S1, RLC-823S2, RLC-823S1W), RLC-830A, E1 Outdoor Series (E1 Outdoor, E1 Outdoor PoE, E1 Outdoor Pro, E1 Outdoor S, E1 Outdoor CX), E1 Pro (hardware version IPC_566/IPC_NT1) and E1 Zoom (hardware version IPC_566/IPC_NT1), Reolink TrackMix Series (TrackMix, TrackMix LTE, TrackMix WiFi, TrackMix PoE, TrackMix LTE Plus, TrackMix Wired LTE), Argus Track, Reolink Altas PT, Reolink Altas PT Ultra
Log in to your camera and go to Device Settings > Detection Alarm. Turn on Auto Tracking and choose a Tracking Type.
Note: Auto tracking settings are only available on Android app 4.25.3.3 or later version and iOS app 4.25.4 or later version.