How to cancel the setting of automatically sending short messages to the other party after hanging up the phone?

Take OPPO R 15 mobile phone as an example, the cancellation method is as follows:

First find the "Settings" item on the phone desktop, and then click Enter.

Second, after entering the settings, find the column of "Telephone" and click Enter.

3. After entering the mobile phone, find the item "Call related settings in navigation" and click Enter.

4. After entering, just turn off the "automatic SMS reply after rejection" switch.