Oppo
Customize Displayed Contacts by Account auf Oppo
By default, the Contacts app on an Oppo phone pulls in every account you have signed in, including SIM cards, Google, and any work or messaging accounts synced to the device. The more accounts you add, the harder it gets to find the contact you actually need.
Coloros includes a filter that lets you pick which account categories should show up in the contact list. This does not delete or unsync any account, it only hides the entries from view inside the app.
Steps to filter displayed contacts
Open the Contacts app and go to Tap on Contacts ➔ Open the Menu ➔ Tap on Customize view ➔ Tap on Customize ➔ Select the desired Categories and tap Save.
Uncheck any account you do not want to see, then confirm your choice. The list refreshes immediately and only shows contacts from the categories you kept active.
This setting is useful if you manage a personal and a work account on the same phone, or if an old SIM import keeps adding numbers you no longer need visible. If you want to remove contacts permanently instead of just hiding them, use the delete or unsync options for that specific account instead.

