Applying Changes to Images Within Stacks
To apply a change to all images in a stack in Lightroom, the stack must first be expanded. Otherwise, changes will only be applied to the image on the top of the stack.
Below, the stack and adjacent image are selected and a one star rating is applied.
Expanding the stack reveals that only the image on the top of the stack (and the adjacent image) had the rating applied
To apply the one star rating to all of the images in the stack, first expand the stack and select the images.

