So I was in the last sizing up of things after making a test board, and while I was working on a part, my board is gone, but the circuit is there.  How do I draw the board back, as going forward or backward does not restore the board?
            
                        
            
                                    
              
                Chrome
                  75.0.3770.100
                Windows
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                                EasyEDA
                  6.1.52