By default, the Xiaomi smartphone asks us which SIM card to use for outgoing calls. To disable the question, we can also set a SIM card as the default.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  SIM cards & mobile networks
Step 3:  Choose a default  SIM card  or  Not set
  1. Open the Settings
  2. Tap on SIM cards & mobile networks
  3. Choose a default SIM card or Not set

Xiaomi Instructions
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