Working with Markups > Annotations > Callouts > To Set Default Options for Callouts
  
To Set Default Options for Callouts
1. Click File > Options. The Options dialog box opens.
2. Next to Showing, select Illustration.
3. Set the default text label and leader line style options for callouts as described in the sections below.
To Set Default Label Size for Callout Labels
1. On the left, select Annotations > Text. The Annotations-Text options open on the right.
2. Select the Minimum label size (characters) setting from the list. (See To Set the Minimum Label Size for Annotations.)
3. Click Apply to apply the settings.