qliksense sorting in pivot table

[ali_hijazi]

Hello

Got a pivot table to which I added 2 rows and 1 column as Dimensions and a measure

the column Dimension has the following values:

Initiation, Defintion, Design & Build, Validation, and Closure

I want these to appear in the above order cause now I'm getting them as follows:

Kindly advise on what to put in the expression under sotring