you can try to add the theme's name to the end of your url, e.g.:
Maybe we are talking about different 'themes' here.
What i'm looking for is the following.
I've developed an app and in the app settings I have selected Sense Focus instead of the default setting,Sense Classic:
With the following result:
But in the dev-hub view this setting is lost and so it does when embedding a sheet with an iframe.
I think what you are referring to is how to set a different theme for coloring and other formats.
So that's what i'm looking for.
But thank you again for thinking with me here, I appreciate it.