Define 'designed at 1x or 2x' during share

Hello, 

I've done a layout design made @15739213 size in a custom-sized artboard. Now when I share the design link with the developers they get the assets @15739213 and @4x sizes. 

Please let me know where I can define that the design is done at @15739213 and it has to produce the assets @1x (i.e., half of what I've done) and @15739213 (which is 100%).

This works if I export assets directly from the XD file and save it in my mac. It gives an option to define that the design is done at 1x or 2x. I am expecting the same while sharing.

Please help me in solving this.

Regards,

Dinesh