Go back to Minecraft. You will see the X-Ray pack in the left column. Hover over it and click the arrow to move it to the right column. Make sure it is at the top of the list.
Finding the right X-ray texture pack for Minecraft 1.8.9 involves choosing between simple resource packs and more advanced setups like to enhance visibility. Recommended 1.8.9 X-ray Packs
version 1.8.9, an X-Ray texture pack is the most efficient way to reveal hidden ores without needing heavy mods. Best X-Ray Texture Packs for 1.8.9
Planet Minecraft : A community hub where you can find various versions of X-ray packs specifically tagged for 1.8.9.