3D modeling for real electronics

If you also add the Move holder on the correct position, you can see from different angles how it fits exactly inside the hole.

The concept of "holes" in Tinkercad, is to remove an exact shape from a solid model, by simply grouping the hole with the solid. As you see when you select the cutout, in the properties window that pops up, the scaling of this model is locked, so you cannot resize it.

The Cutout is designed in such a way that the hole includes the switch and leaves enough space in the bottom of your design for it.

However, if you'd prefer that the switch sticks out past the wall of your design, it is doable by keeping that extra amount of the Cutout sticking out the side of the wall before grouping the parts.