Dimensioning a sketch in SW 2015

I upgraded two computers to 2015. In 2014, if I want to dimension a sketch, I draw a line, click on it and a modify dimension box comes up. There are two fields in the box, one is a description, like D1@sketch1, the other field contains the dimension. The dimension box is highlighted and I can enter a dimension in this box. In one of the 2015 computers, the dimensioning process changed... the description field is highlighted, and I have to manually click in the dimension field to enter a dimension. Is there a setting that controls which of the two fields is the default? I have no idea why one computer changed and the other did not. Thanks. 

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