There's the Automatic Scene Switcher, in the Tools menu. It switches scenes based on the currently active window.
If that's not what you want, there's the Advanced Scene Switcher that grew out of that, and has become a powerful automation tool in general:
This plugin will allow you to automate various tasks using "Macros". Macros consist of a list of conditions under which a list of actions will be performed. Examples and guides can be found in the wiki. Feel free to contribute! If you run...
obsproject.com
If you need help with this one, you can use the discussion thread:
Warmuptill submitted a new resource: Automatic Scene Switching - Switches to specified scenes depending on which window is in focus A remake of the "Simple Scene Switcher"(https://obsproject.com/forum/resources/simple-scene-switcher.29/) for obs-studio. Installation 1. Extract the folder. 2...
obsproject.com