How to open images in fullscreen without showing the toolbar or the page in the background?

I'm working on preparing a TTRPG campaign and I'm using Notion like a DM screen. I have notes that are only for me, as the game master, and I have images (maps, texts, and screenshots from the video game the campaign is based on) that I want to show my players as they progress. I want to be able to open those images directly from my notes and put them on a projector for my players, but I don't want them to see my notes page in the background. I've attached a screenshot to show what I mean. Is there any way to do this?

Thank you kindly! (and shoutout if there are any Outer Wilds fans in this subreddit!)