When you select the drafting standard (and the revision), the default settings for feature control frames 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 Feature Control Frame Settings dialog box, the text and leader settings default to “By NameOfCurrentDraftingStandard.” If you modify the master settings, feature control frame symbols automatically acquire the new settings. If you do not want feature control frame symbols to follow the master settings, you can override the text height and select a specific value.
You can also specify what geometric dimensioning and tolerancing (GD&T) symbols are available for selection when you insert a feature control frame into a drawing.