Linear

Linear mode distributes parameter variation evenly among the selected elements.

Layer Time Offset

For layer time offset, this distribution is done between the block under the mouse cursor when clicking, and the block furthest in the stack.

All other selected layers will be distributed between these two reference layers.

Proportional Distribution

In the video above, you can see that depending on the block you click on, only one of the two blocks at the edges of the selection sometimes stays in place.

By checking the Proportional option, these two blocks will stay still and distribution will be differentiated between:

Distribution Across Other Parameters

Linear mode can be used to distribute a variation across several parameters that are the same type.

In the example below, we clicked on the layer at the top of the stack, which defined it as the active layer, then we pressed the shift key before clicking on the lowest layer in the stack.

With this set of layers selected, we can modify the Position.Y parameter of the active layer, as displayed in the Inspector, in the Properties section.

The distance traveled by the active layer is evenly distributed between the selected layers:

Changing the Active Layer

To define a new active layer, simply press the ctrl/cmd key, click on a layer to deselect it, then click again while holding ctrl/cmd to reselect it.

Changing the Position.Y value again will have a completely different effect. Also note the influence of the Proportional parameter when activated, which does not move the two layers at the edge of the selection in the stack.