When we're run in headless (LR) and we want the desktop experience, the viewport behavior is quite undefined, leading to screenshots that are cut off:

We think desktop "emulation" is the answer here. I've tried it out and everything looks more expected in headless:

TBH our driver & emulation code don't nicely account for this scenario, so it'll need some thought. @patrickhulce this seems up your alley. watcha thinkin?