Lines in layout

Hi there, I was wondering how do I make the lines I draw in layout appear in viewport? Thank you so much.


The whole point of layouts is that objects you draw in layout space (i.e. without activating any of the layout viewports) are not visible in model viewports. They might even span more than one layout viewport, so how are you going to present this in model viewports? And as these objects are 2D only, how would you present it in a 3D perspective model viewport?
If you want to print those objects, you should do so from layout space.
Unless you are talking about lines drawn in an activated layout viewport, which should behave the same as any viewport, including printing/plotting them.