To delete a bracket on-screen, click a bracket
handle, then press DELETE.
Or, click a group handle, then choose Staff > Edit
Group Attributes. (Or, double-click a group
handle.) Or, choose Staff > Edit Group Attributes menu without
selecting a group. The Group Attributes dialog box appears. To display
the attributes of another group, click the spin controls to select another
Group ID number.
Select None from the Bracket palette, then
click OK. Finale removes the bracket from the group.