If we've disabled automatic network selection on the Xiaomi smartphone, we can easily enable it again by selecting the SIM card individually if dual SIM is used.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  SIM cards & mobile networks
Step 3:  Choose a  SIM card   (Dual SIM)
Step 4:  Tap on  Mobile networks
Step 5:  Enable  Automatically select network
  1. Open the Settings
  2. Tap on SIM cards & mobile networks
  3. Choose a SIM card (Dual SIM)
  4. Tap on Mobile networks
  5. Enable Automatically select network

Xiaomi Instructions
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