The Plunge function controls whether to Plunge between the Line/Arc Segments of an object when applying a Non-Blade Tool.
If Non-Blade Tool leaves a Dot where it plunges, unselect Plunge.
If Non-Blade Tool takes Too Long to apply, select Plunge.
This is different from the Plunge Count which controls the number of Blade Plunges for each Blade Cartridge before pausing for a Blade Change.