You have a feature for, what you call, Integrated Calling. You can see it from here.
In that link you state that it can be disabled so that the user does not have to see the Ring Central call on their native call app history, but the user can still have the Ring Central app installed to make and recieve calls. Here is the KB telling how to disable it. https://support.ringcentral.com/article/10693-RingCentral-Phone-Mobile-App-Managing-Integrated-Calling.html
The problem is that the instructions for disabling Integrated Calling are for your old mobile app. I have reached out to support and they say disabling this is no longer available on the new RingCentral app. That is what I suggest you add back in. To be able to remove the Integrated Calling feature on the new mobile app.
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