What size should the psd layout of the site be in order to get the actual dimensions?

Question

css

There is a Psd package, the size of the layout image is 5000 wide +
Then what size in Photoshop you need to reduce the size of the layout, or what settings need to be corrected so that you can get real sizes, font indents, and so on.
Since when resizing the image in the layout, all sizes change,
and even the smallest indents when measured through selections, it shows a huge, relatively large size of the layout resolution.

Answer 1

Most likely a retina layout. For conventional monitors, reduce by 2 times. But better check with the designer. What did he mean by such a layout.