1) When I want to submit content, I am presented with the Editor. But when I choose to go somewhere else (clicking any link) without entering anything, a message "Please either cancel or save your current change". How can I avoid/skip this message?
The preferred way is if I don't enter anything, the message should not appear. If I enter anything in the Editor, the message looks fine.
Also is it possible not to refresh the the screen after the above message appears?
2) How can I remove Image/Publshing/Metadata section at the end of Editor?
I think you may want to select the 'Apply' button to save changes without exiting the Editor, or the 'Red X' to exit the Editor without saving. Although, I'm not getting a clear understanding of what you mean.