you might have to adjust display settings on your pc
to 1920x1080 or try another resolutions until it suits.
next would be the zoom percentage on your pc display settings.
it is defenatly your settings in display which needs to be set.
try the link below.
https://www.techwalla.com/articles/how-to-make-my-computer-picture-fit-the-screen-on-the-tv
