How to: Change pen color during slide show.
Solution:
Select 'Pointer Options' from the 'Show Popup' menu, and select 'Pen Color'.
1) Click right mouse button. (The Show Shortcut menu appears.)
Show Shortcut menu
2) Select 'Pointer Options'. (A submenu appears.)
3) Select 'Pen Color'. (The Pen Color menu appears.)
Pen Color menu
4) Select the desired color.
NOTE: New lines will now be drawn in the new color.