There is no way to access the list of extensions in the Window -> Extensions.
I can add them manually in the .toml file, but don’t know where to find a list of all the available extensions from the Omni Kit template.
I’m specifically trying to install the Windows -> Command History so I can get a good idea of available methods for different things like Prims etc. The API code examples are ok, but they’re missing a LOT of the methods.
Go into the extension.toml, and under [dependencies] add:
"omni.kit.window.extensions" = {}
You can then select the extensions. To add the command history, I needed to add Command Utils and Graph USD UI Commands, and then it appeared in the Window file menu.