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SIM cards can be activated or deactivated on the Oppo Smartphone independently of each other. For example, to be unreachable on a SIM card, it does not have to be forcibly removed from the device. To do this, it is sufficient to activate (or deactivate) the switch in the settings.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  SIM card & mobile data
Step 3: Choose a  SIM card   (Dual SIM)
Step 4: Turn On/Off the  SIM card
  1. Tap on Settings
  2. Tap on SIM card & mobile data
  3. Choose a SIM card (Dual SIM)
  4. Turn On/Off the SIM card
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Oppo Instructions