The easiest way to select all callouts is Ctrl+A when the Callout tool is active. That way you can apply modifications of single attributes or a complete preset to all Callouts within one click.
BTW: Ctrl+A works with several other drawing tools in the same way. Much faster for that purpose than the Find and Replace wizard.
Regards,Klaus.
That's awesome!
Too bad this little trick doesn't work in Coreldraw