Turn off "do you need to get there at a particular time"?

 

A TomTom GO 740 seems to typically ask if I need to get to my destination at a particular time at the start of route planning. Is there a way to say I never want to do that so bug off?

I have looked in preferences and cannot seem to find it.

Thanks

Later: I have discovered it is coupled to whether or not I want leeway times displayed in the status bar.

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Ken