Wiped PC, now viewport size problems

Hey there everyone, I recently did a reinstall of windows onto my PC, which uninstalls programs but is SUPPOSED to keep the majority of my files.

After having done so, I now previewed my game to see giant black bars alongside each side of the screen, with the screen much farther away from the game than pre-reinstall.

Example: gyazo.com/3979ff9765b4d872fa7998d9091c214e

Tried:

-Changing my computer resolution

-Changing each property under the "project properties" tab, more specifically each fullscreen mode and viewport size. The best fullscreen mode was scalar-in, but it cut off portions of the layout which isn't great :(

Have you tried this ? youtu.be/pdtqjw1J8_U

By changing fullscreen mode to scale outer and set your UI to fits with any size of windows or even mobile phone screen by adding some events.