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wow not only are you using mac which I said I was guessin...

wow not only are you using mac which I said I was guessing at, but a non US version too just to really confuse me - ROFL

I honestly have no idea since there is nothing on screen, do you have an edit menu, perhaps with the estimate on screen there is something in that menu to close.inactivate it - or maybe right click on the estimate in the list on the left and see if that has an option

Other wise, sorry but I can't help, hopefully some mac user will come along and know the answer