Welcome to the Forum, @prentice1903! 
Are you possibly talking about Cam v3? They made some changes with recent updates in order to improve consistency across Cam UIs, and that has apparently moved the night vision mode toggle off the Live Stream screen. I don’t have any Cam v3s to check, but for other (newer) Wyze Cams you typically find the control at Settings ➜ Advanced Settings ➜ Night Vision Mode.
I’m not personally a fan of that and wish Night Vision Mode had its own section directly under Settings with a live view, just like Spotlight Settings does (for Cam v4 and Cam Pan v4, anyway) so that users can change the settings and immediately see their effects without navigating all the way back to the Live Stream screen. That gets tedious pretty quickly and seems unnecessary.
Feel free to visit that first topic I linked above and share your comments about the toggle. I’m sure you’re not alone with that. The initial post in that topic also includes a link to a survey where Wyze is soliciting more feedback about the UI changes.