When you select the drafting standard (and the correct revision), the default settings for datum target symbols change to match that drafting standard.
If necessary, you can customize these settings to suit your drafting requirements.
Because text and leader lines are the most common objects used for annotations, AutoCAD Mechanical toolset provides a single configuration point (the Standard Settings dialog box) enabling you to specify their default properties. These settings are the master settings.
In the Datum Target Settings dialog box, the text and leader settings default to “By NameOfCurrentDraftingStandard.” If you modify the master settings, datum target symbols automatically acquire the new settings. If you do not want datum target symbols to follow the master settings, you can override the text height and select a specific value.
For datum target symbols with circular and rectangular terminations, you can specify the hatch angle, hatch spacing, and boundary line type. For datum target symbols with point terminations, you can specify the size of the point of termination and specify whether or not the symbol includes an arrowhead.