Workspace, macOS

[W.Taba]

Please can someone explain to me why the working area with dimensions of 1200x800 looks like this for me, that is, it is very distant despite the approximation of 100%

[Stephen_A_Marsh]

Are you using a Retina or similar high pixel density monitor?

[W.Taba]

Yes, I have a liquid Retina display on a MacBook pro 16 inches

[c.pfaffenbichler]

The canvas appears to be displayed at exactly 1200px x 800px, so what is the problem? 

Might you be confusing »pixel« with a unit of measurement of length.