Quick Edit Greyed out in Custom List

I have set up a SP 2013 environment using the trial software.  I have created a new custom list using theCustom List App.  I've created all the columns and I just want to use Quick Edit to be able to cut and paste columns from an excel sheet (I'd prefer to import the excel sheet but that icon is missing!).  Unfortunately, this is greyed out.

Just to test further, I created another custom list using the Custom List in DataSheet ViewApp - I can use Quick Edit in this list.

Is there a way to enable Quick Edit in my original list..?  I don't want to recreate all the columns again - there are quite a few.

Thanks