A typical "legit" flex in 1.16.5 includes:
X-Ray is a modification that makes common blocks—like dirt, stone, and gravel—completely transparent. It leaves only valuable ores, chests, and structures visible. Texture Packs vs. Forge Mods
The Minecraft 1.16.5 update, known as the Nether Update, remains one of the most popular versions for multiplayer servers and modding. Finding rare resources like Diamonds and Ancient Debris can be incredibly time-consuming. This is why many players turn to X-Ray tools.
If you want a dedicated mod with a toggle hotkey, you will need a mod loader like Forge or Fabric. Step-by-Step Installation Guide