I had experimented with this in the past and it wasn’t awesome at the time. However, it’s working a lot better now, in case anyone is interested.
When I’m using my laptop with two connected screens, I’d rather not use the laptop screen. Why? Three screens isn’t 3x better, I just don’t need it and find it distracting most of the time. And I don’t like the difference in resolution when moving stuff around.
By changing my power profile, I can have it that my screens switch when I close the lid. And as this would only happen when I’m plugged into the Dock, this works very nicely.
Just change your power option to “Do Nothing” when you close the lid when plugged in.
This may not be for everyone, but it is for me.