Hi,
Global change:
go to Format --> Style --> Stile Type Dimension and select Style
you want. Then 'Modify' --> Tab 'Lines and Coordinate' change
the value for 'Stack Pitch' default is 3 times the current font
size.
For a local change select one of the stacked dimensions, RMB
Properties --> Tab 'Lines and Coordinate' and change the value
as above apply with OK
dy