Basically I want to go from this:
I know it's weird/unusual thing but it's what I want. I don't care that half the screen gets cut off.
How can I do this on my windows 10 laptop? Thanks.
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I don't know of a solution for duplicating half of the screen and for both halves to be functional.
The only solution I can think of is to use a magnifier that can be adjusted to mirror the left half over the right half.
An example magnifier that is adaptable enough to more or less fulfill the requirement is Magnifixer:
The above was created by dragging the magnified area to the upper-right corner of the screen, then resizing it to cover half of the screen. Finally, I moved the cursor to the top-left corner and set "Fixed location" via the shortcut Ctrl+F to stop it following the cursor.
The only problem here is that Magnifixer insists on having white borders around the area.