Download videos not showing correctly

Hi, I have 2 issues:

1. The download folder shows the icons very small like a list with description, download date size, etc.., is there a way to change this? (in the past I saw just a big image with title and that's all)

2. I downloaded some videos just fine but there was an update or something and now I see the PNG and the MP4 files, so the icon for the MP4 is almost always black and this is really anoying. In the past I just saw the PNG image and clicking there would open the MP4 file. SO there is no way to know what the MP4 file is