As the title suggests, the Xiaomi smartphone can automatically disable the personal hotspot when no devices are connected.

Note: We recommend enabling this feature to save battery power in case it is forgotten.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Portable hotspot
Step 3:  Enable or disable  Turn off hotspot automatically
  1. Open the Settings
  2. Tap on Portable hotspot
  3. Enable or disable Turn off hotspot automatically

Xiaomi Instructions
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