"Presentation" mode not filling the browser window anymore?

[CreativeComanche_ml3ds]

Over the past few XD versions (including the most current), the shared "presentation" mode no longer properly fills the browser window as it always had up to this point. Does anyone have any insight into this or is this happening to anyone else? Here is an example (the white space is even more prominent on higher resolution monitors):

[Atul_Saini]

Hi CreativeComanche_ml3ds, 

Thank you for reaching out and sorry for the delay. Would you mind sharing the dimensions of the artboard and the resolution of the screen which you're viewing it? 

Thanks,

Atul_Saini

[CreativeComanche_ml3ds]

Artboard dimensions: 1920x1080

Screen Resolution: 2880 × 1800 (2015 macbook pro)