When you're dimensioning a drawing, it's nice to space your dimensions out evenly, to make sure that the text and lines don't overlap, and to give a uniform look to the drawing.
But maybe you were lazy (or in a hurry) when you placed your dimensions, and you just clicked around randomly:
Fortunately, there's a command for that.
It's called "Adjust Space", or DIMSPACE, and it's on the Dimensions panel of the Annotate tab (right next to Break Dimension).
You pick a base dimension, and then the dimensions to adjust, and the command redistributes them until they're nice and uniformly laid out. You can enter a value for the spacing yourself, or use the Auto option to let AutoCAD LT figure it out.
There, isn't this better?