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I think you're misunderstanding. What you are describing is known as a 'drill driver' - a universal tool that has a normal drill setting, a hammer drill setting and sometimes a third torque sensitive driving setting.
What is generally being discussed above is an impact driver which works on a different system and is good only for driving tough fasteners. I've never seen an impact driver where you can switch off the impact, but perhaps there is one that exists somewhere.
This article discusses the general differences between them but tldr is that a hammer drill provides impact along the axis of the drill, whereas an impat driver provides impact as a rotational force.
chiroshi
Nef
Yes a collar that rotates to lock out the impact.
Mine are too old but some newer ones have a hammer icon and a screw icon.