MPU6050 seting the same 0 degree value

Hello! I am trying to make a balancing robot, but there is a problem that I don't know how to fix.
I have an MPU6050 and I use this library to get data from the MPU6050. I use the DMP6 example and the problem I am having is that when I power up the board (NodeMCU ESP32S v1.1) I have to send a character in the serial port and that sets the 0 degree position to be the one it is when the character is sent.
The question is how to have a set 0 degree position without sending any character in the serial port and be able to turn on the robot without any calibration of the 0 degree position?

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