Screen recording quality in Samsung Galaxy Tab S9

I'm using a Samsung Galaxy Tab S9. Mostly, I use it for video recording for educational purposes, and it involves screen recording of my PPTs and PDFs from which I teach. I have set my screen recording quality to full HD. But still, whenever I record the screen, my tablet optimises it heavily and gives me a little blurry video like 480p. The iPad gives me a full HD version of the video, but Samsung doesn't. So, is there anything that I'm missing, or is there any alternative option to record my screen in real full HD? Please help.