The Terrain Following setting in your Game Configuration allows you to customize how the player character reacts (specifically, how their vertical position is determined) as they walk across tiles in the game world.

Combining

With this option, the player's vertical position will always follow the terrain geometry exactly.

With this option, linear interpolation is used to calculate the player's vertical position while moving to the next voxel coordinate. This means that changes in height from one voxel coordinate to the next will be smoothed out into a straight-line path and is suitable for games where you want inclines, like stairs, to have linear movement as if walking up a ramp.

With this option, the smootherstep function is used to calculate the player's vertical position while moving to the next coordinate. This is the default setting and provides a good balance between closely following rises/drops in terrain without the sudden snapping up/down that the “Precise” option results in.