How can I stop media volume turning down when I’m on a call.

Just got the new Iphone 14 today, got on a call and tried to turn on a youtube video as well as watch tik toks. As I was watching, I noticed I couldn’t hear my videos but as my friends voice came in and out, the video would get quieter and louder. To the sound of my friends fan also coming through my call, the audio of my video would proceed to get quiet and loud over and over again to the sound of the fan. Making my ears hurt and stressing me out. This is the most annoying thing ever and I don’t know how to get rid of it. I want my call and media to be the exact same volume. Please help me turn it off.