3.0 Text options
In the Format->Style->Rehearsal marks there is no option to globally adjust the frame around it. If you want to change the style of the rehearsal mark, you must change each one as it's entered or select all similar and change them at once when the score is complete.
The frame options are actually missing from all global text options as well as other formating options such as Bold and Italics. I believe all of the style options from version 2 should also be available in version 3.
One more text related item. In version 2 you could create your own text style and apply it quickly to a (or severs) text item(s). I also miss this option. You now must remember all of the text options you put on an item and then apply them to others. 😒