IF you ever see your ps4 gaming controller closely, then you will see a small hole at the bottom of your ps4 controller, not the screw is not missing from your ps4 controller.
This whole is used to rest ps4 controller it helps when you faced problem with your controller like below.
If you have Dualshock 4 problems like charging the controller or pairing it to the PS4 again and again then you can use that port to rest ps4 controller.
How to Rest PS4 Controller?
If your controller won’t pair, won’t respond, or is displaying a flashing light, please follow the instructions on how to reset the controller:
1.Turn off the PlayStation 4.
2.Locate the small reset button on the back of the DualShock 4 near the L2 shoulder button.
3.Use a small, unfolded paper-clip or something similar to push the button (the button is inside a tiny hole). Hold the button down for a couple of seconds and release.
4.After resetting the controller, re-pair the controller with the PS4 by connecting the USB cable to the controller and the system, and turn the PS4 on.
5.Press the PS button to log in to the PS4
This is how you can reset your PS4 Controller easily !