Turn On Visuality Hit Particles in a World
Visuality is a resource pack only. It does not need any Experimental Features toggles, so you can add it to an existing world without changing its gameplay settings.
Activate the pack
1. From the main menu, open Settings and go to Global Resources. To use the pack in only one world, edit that world and open its Resource Packs tab instead.
2. Under My Packs, find Visuality and press Activate.
3. If you run other resource packs, check the active list. Packs higher in the list override packs below them. Move Visuality toward the top so another pack doesn't replace its particles.
4. Leave the Experiments section alone, because nothing there needs to be switched on.
5. Load the world.
Check that it works
The quickest test is a skeleton. When you hit one with Visuality active, it leaves a bone particle.
If no skeleton is nearby, attack a chicken or sheep instead. Both are on the pack's list of supported mobs and are easy to find in grassy biomes.
Keep in mind that not every mob reacts. The pack currently covers 12 mobs, and hitting anything outside that list shows only the normal vanilla hit effect. If a listed mob shows nothing, return to the resource pack screen and confirm that Visuality is still active and sits above your other packs.