Hi. The phone is taking HD videos including the picture and the sound. For me this is a plus feature, as I like my recordings to be as HD as possible, last year I recorded videos in the forest and all the birds and the wind noise was successfully reproduced by the phone.
If you are annoyed by the extra noise in your videos, you can play around with the noise and delete any noise/voice you don't want from the video AI editing tools from the native gallery app, which now includes a feature Audio Eraser.
I hope you have updated to Android 15 and UI7 to make this feature available on your phone.