You can remove the nav points using the erasor tool (top of the screen, the 2nd or 3th frm the right)
When you use the Plotting tool you can move the nav points. Make sure you have the nav tool active. Mouse over a nav point press LMB (left mouse button) keep it pressed and move the nav point around.
if you keep CTRL pressed also you can set nav points inbetween.
This is about all I know about plots.
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