You can define any shape to be included in the list of available arrow styles. Only the form of the shape is added as a black filled arrowhead.
Use the draw functions to create the shape to be used as an arrow style.
Select the shape and choose.
In the dialog, click thetab.
Click Add and assign a name to the new arrow style.
Nhấn vào nút OK để đóng hộp thoại.