How to scale wireframes for Presentation mode with the new interface.

Hello 👋 Complete newbie here. I have a wirefame that’s perfect in Preview mode. But when I want to show it in Present mode the frame is at 100% percent zoom?! Where/how can I adjust the scale with the new interface? I have been searching for the answer and watching Figma videos all week but can’t work it out 😭 Pics below for reference

Preview mode

Presentation mode