How to match the exact screen size/resolution with the designer workspace?

Hello Everyone,

I am currently working on developing a project and use perspective to display on a 4K screen (4096x2160), resolution on My Laptop where I am doing the design is at 1920x1080. Is seems that when I run a session on the 4K screen it does not match the size on the workspace.

In the picture in My workspace, I put a led display in the right most edge of the page display (workspace) and the second picture is the large screen. the object is not viewable unless you scroll all the way to the right. Please help.