I have just updated to Stoyline 360 to Build 3.16.15842.0 and am trying to set the new modern player to chromeless optimal size. I cannot see any way to set the browser size to optimal size or less than full screen. The options are grayed out unless you select launch as new window.
I always use set to optimal size as html creates poor quality images when stretched. Is this a limitation of the new modern player ( always full screen correct aspect stretch)?