Not sure if I follow but the size of the image when you drag and drop it into Designer Pro X is determined by the setting for Resize large imported photos down to: in Page Options > View.

If I drag and drop an image that is 2044 x 2906 px into XDPX, it comes in at full resolution but the physical size is determined by my Resize large imported images. In New > Blank Photo the image comes in at actual pixels at 1:1. If I open a new website and drag and drop the photo it comes in at 1350 x 1920 px or 66%