Canvas not matching aspect ratio

I was using this image on my computer to test and make sure the ui is scaling right so I can add a border to my game. I have been trying to fix this for hours. Everything online is telling me to change things I don’t even see in the project settings when I open it up.

How can I go about setting my canvas for the resolution

Your base/first object is always stretched to cover your screen (or the specific size of your widget but if you’re adding it to the viewport it is your screen)

Add your image as a child of a canvas and set it’s dimensions on the side like so:

If you want it to scale but keep its proportions put it in a SizeBox (still inside the canvas)