Preferences
The Preferences Panel allow to change some global setting in Plot
Open Initial Empty Document: If checked Plot starts with an empty document.
Hide Document Toolbar: If check the document title bar has no toolbar.
Time Format: Set the default format for time values used in Plot.
Default Font: Set the default fonts for axis labels and axis numbers.
Set Default Style: If clicked the style of the current working buffer in the current document will be the default style for newly generated data buffers.
Colors: Here you can define your own default colors used by Plot. It is also possible to restore the default colors provided by Plot.