Starting with ColorOS 7 (Android 10), it is possible on the Oppo smartphone to have the WLAN hotspot automatically deactivated after 10 minutes of inactivity.

Android 10 | ColorOS 7.0
Step 1:  Open the  Settings
Step 2:  Tap on  Other Wireless Connections
Step 3:  Tap on  Personal hotspot
Step 4:  Enable or Disable  Automatically turn off personal hotspot
  1. Open the Settings
  2. Tap on Other Wireless Connections
  3. Tap on Personal hotspot
  4. Enable or Disable Automatically turn off personal hotspot

Oppo Instructions
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