Once ReAlexey Shaders is placed inside your shaderpacks folder alongside a compatible loader like Iris or OptiFine, you can turn the portrait filter on or off directly from your pause menu during any session.
Activating the Portrait Effect
1. Pause your game or start from the main title screen and open Options.
2. Click on Video Settings, then open the Shaders or Shader Packs menu.
3. Select ReAlexey Shaders from your list of available packs.
4.
When you return to your world, standard screen pixels will immediately be replaced by repeating face portraits across blocks, mobs, and held items.
Returning to Vanilla Visuals
Because ReAlexey Shaders works as a gag pack for humorous sessions, you will likely want to turn it off when you need clear visibility for precise building or inventory sorting.
1. Open Options > Video Settings > Shaders again while in your world.
2. Select Off or (internal) at the top of the shader list, or use your shader loader's built-in toggle keybind if you have one set in Controls.
3. Confirm your choice to restore standard Minecraft pixels instantly without restarting the client.