I don’t know what you mean by by this. The ChordPro window is completely separate from the Setlist window so that it can be displayed on another monitor, for example.
With a trivial piece of GP Script, you can arrange for the ChordPro window to open or close automatically or when you press a widget button or a button on your controller that’s mapped to that widget button.
This is really more a question of priorities. Many people use tablets to display sheet music as well as to automatically send messages to Gig Performer to select songs, etc., so other (great) features have generally had higher priority. There’s also some work being done to develop a ChordPro “extension” for Gig Performer using the SDK we provide to allow third parties to create add-ons for Gig Performer.