Must a vehicle driving in the left lane on a motorway because it has overtaken return immediately to the right lane?

Explanation
When overtaking and driving in the left lane once the overtaken vehicle has been passed, the driver must signal the lateral shift to the right and return to the right lane in a progressive and safe manner, provided that this lane is free and traffic conditions allow it.
Under no circumstances should the driver swerve or make sudden movements to return to the right lane.
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