Quality deterioration

Hi, I'm confounded! I recently switched to Google Pixel4 and while I thought I had my video setting right, I am clearly doing something wrong. 

I am having to enlarge the video when I import into my Premiere Elements Editor and then it just doesn't look as smooth as the original. I tried to run Shake Reduction and got the error message 'Shake Reduction requires clip dimensions to match project.' so clearly I don't have it right, but not sure where I am going wrong.

I am attaching screenshots showing project settings and clip settings.

Any suggestions are most appreciated.

TIA