USING ESC TO CANCEL
All over in Delogue you can use the ESC button instead of clicking on the Cancel button.
USING CTRL + ENTER TO SAVE
If you want to Save something you can use Ctrl + Enter - in most places in Delogue instead of clicking on a Save button.
The general rule is that if there is only one green button - then you can activate that by clicking on Ctrl + Enter.
Please note that if your cursor is inside a text editor - then you can not use this short cut.