Why doesn't my dashboard fill the screen when viewed on the Tableau Public site?

I've created dashboards that are sized to fit a laptop screen (1920 x 1080) and, when viewed in full-screen mode in the Tableau Public app or in Tableau Reader, it fills up the whole screen. But when I view it on the Tableau Public site in full-screen mode, it doesn't fill the screen. How can I fix that? Here's the link: https://public.tableau.com/views/SanteFe_Stage2_Leadership_Survey_Dash_031621_1920x1080_toshare/RangeofResponsesDash?:language=en&:useGuest=true&:display_count=y&:origin=viz_share_link

(Note: I'm reposting this because my earlier post was delete. Also, I got a response from a Tableau Ambassador but it was addressed to someone named Saqib and it did not address my question. So there seems to have been some confusion. Still looking for an answer about sizing on Tableau Public.)