When the mouse pointer is upon one of these indicators, it changes to indicate
you can drag and drop that point to change the matching attribute of the selected dimension. While you drag and drop
the mouse, the size the modified dimension and the length it displays is updated in the plan.
A dimension may also be edited thanks to its pane, by double-clicking on that dimension in the home plan,
or by choosing Plan > Modify dimensions... after selecting it.

In the dimension pane, you may change the coordinates of its start and end points,
the length of its extension lines, if it's a plan dimension or an elevation dimension
measuring the height of an object, its font size, its color and whether it should be displayed
in the 3D view.
When a dimension is displayed in the 3D view, you may also set its elevation and whether the length label
should be horizontal or vertical when it's a plan dimension. In the following image, the dimension
180 is an elevation dimension, the dimension 35 is a plan dimension with a horizontal length label
and the dimension 85 a plan dimension elevated at 180 showing a vertical length label.

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