how to enable navigation bar | no 3-button navigation bar fix on Android

Is the 3-button navigation on an Android phone no longer present? Watch this video to learn how to activate a three-button navigation bar on an Android phone.
to everyone who watched my simple tutorial videos. Everything you watch is based on my own research and experience. Some videos may not match the tutorial on your devices. I am not a professional, and everything I know is based only on my research, experience, and general knowledge. Thank you very much for understanding.
I'm using the app below to record my device screen. (not sponsored)
Screen Recorder & Video Recorder - XRecorder
play.google.co...
the Audio/music I use in my videos comes from. UA-cam Audio Library
/ @simplephonetutorial444
UA-cam Audio Library License
You’re free to use this audio track in any of your videos, including videos that you monetize.
No attribution is required