This article is in the Projects > Design section of the App.
When designing in Design, you are able to undo and redo changes that are made.
For example, if you'd quickly like to undo a panel group you just created, press cmd(⌘) + Z/ ctrl + Z or click on the undo button on the top right hand corner.
You can also then redo this by pressing cmd(⌘) + Y/ ctrl + Y or click on the redo button on the top right hand corner.
Note: If multiple changes are made while the system is calculating then pressing undo will undo all of the changes.