You can set the default SIM card for calls on your Huawei device. Direct calls, like for example over Quick dial will be made automatically over the set SIM card.

Android 10 | EMUI 10.0
Default-SIM for calls -  Open the  settings
Default-SIM for calls -  Tap on  Mobile network
Default-SIM for calls -  Tap on  SIM management
Default-SIM for calls -  Tap on  Default calling SIM
Default-SIM for calls -  Choose a  default calling SIM
  1. Open the settings
  2. Tap on Mobile network
  3. Tap on SIM management
  4. Tap on Default calling SIM
  5. Choose a default calling SIM

Huawei Instructions
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