How to Find and Fix Key Binding Conflicts From a Mod's Settings Page
When two controls share the same key, pressing it can trigger the wrong action or nothing useful at all. Mezz ConfigGUI Mod shows key bindings right next to a mod's options and highlights conflicts, so you can spot problems while you're already adjusting that mod.
Spotting the conflict
1. Open your mod menu from the main menu or the pause screen.
2. Select the mod whose controls are misbehaving and open its configuration page.
3. Unfold the subsections and look for the key bindings shown alongside the options.
4. Look for any highlighted binding. The highlight means that key is also used by another control.
Resolving it
1. Note which action is highlighted and which key it uses.
2. Rebind one of the conflicting actions to a key that isn't already taken. You can also use vanilla Minecraft's Options → Controls → Key Binds screen, which lists every binding in one place.
3. Pick a key you can comfortably reach but that isn't used for movement, inventory or other actions you press often.
4. Return to the mod's settings page and confirm the highlight is gone.
5. Save your changes so they apply right away.
Checking in-game
Load into a world and press the new key to make sure it triggers the right action. If you run many mods, repeat this check for each mod you've recently installed, since new mods often claim keys that are already in use.