Select the arrows tool.
Click on the workspace with
the left mouse button. Let it loose. Move the mouse and a red line is drawn.
Double click with the left mouse button. An arrow head is automatically placed
at the end of the line.

Activate the work area by clicking on the this button.
Go on the yellow point and
click the right mouse button.
Select for example type 6.
The shape is changed to this
kind of arrow:
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With BrushColor you may change the colors
Select for example RedGreenBlue
255,0,0 and you get red.