✅ | how can i make a button to go on full screen mode?

[buoyant wagon]

You can’t directly toggle fullscreen with a built-in “go full screen” action, but you can mimic Minecraft’s fullscreen keybind.

1. Add or select your button in the layout editor.
2. Right‑click it → Edit Action Script.
3. Add a Mimic Keybind action.
4. Set the value to:

   key.fullscreen|||false|||0
   

   (This presses the fullscreen keybind once.)

That will trigger the same behavior as pressing F11, so the button switches Minecraft into/out of fullscreen. If you need it to hold the key for a moment, set keep_pressed_bool to true and set duration_ms (the third part) to the number of milliseconds you want it held.

More details are in the Action Scripts documentation under Mimic Keybind.

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[buoyant wagon]

Hmm, sorry that didn’t work. Could you double-check if the button already triggers anything else that might conflict? Also make sure Minecraft’s fullscreen keybind hasn’t been remapped — FancyMenu’s Mimic Keybind action relies on the keybind identifier (key.fullscreen) being valid. You can confirm it by opening Options → Controls and verifying the “Fullscreen” keybind is still set to F11 (or note the keybind name if you changed it).

If the keybind was changed, use that new identifier when editing the action — e.g. key.your_custom_keybind instead of key.fullscreen.

If you’ve already done that and it still refuses to work, let me know:

1. What Minecraft version and mod loader you’re using?
2. Are there other actions or requirements on the button?
3. Does pressing F11 manually toggle fullscreen for you?

That extra info should help me narrow it down.

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[buoyant wagon]

Thanks for the screenshot! It looks like your action value is missing the needed ||| separators or order. Double-check that the action value is exactly this (no spaces):

key.fullscreen|||false|||0

That tells FancyMenu to trigger the fullscreen keybind once. If you remapped the fullscreen key in Minecraft’s controls, replace key.fullscreen with the actual keybind ID shown there instead.

Also make sure:

• The button only runs that action (no conflicting actions or requirements).
• Pressing F11 manually still toggles fullscreen—if it doesn’t, Minecraft won’t do it either.

If it still refuses to work, let me know whether you’re in a special window mode (like Borderless) or using any UI mods that might intercept the keybind.

Changing the Windows desktop background isn’t something FancyMenu can do—its actions run inside Minecraft, so they can touch files in your game folder but not control your OS settings. You can, for example, use actions like Create File in Game Directory / Write File in Game Directory to prepare data, but you’d still need to set the wallpaper manually outside of Minecraft.

Downloading a file is doable inside Minecraft. Just add a Download File to Game Directory action to your button and set the value to url||target_folder (e.g. https://example.com/whatever.png||downloads). FancyMenu will fetch that URL and save it under the given folder inside your instance root. You can chain this with other actions (copy/move) if needed. Check the Action Scripts documentation for the full list of file/OS actions and their value formats.

[fringe birch]

This is not the correct action to invoke a keybind.

You use Mimic Button instead of Mimic Keybind.

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[fringe birch]

I just told you 😅

@buoyant wagon

[buoyant wagon]

Use the Mimic Keybind action (not Mimic Button).

1. Right-click your button → Edit Action Script → Add Action → Mimic Keybind.
2. Set the value to key.fullscreen|||false|||0 (or key.<your fullscreen bind> if you remapped it).
3. Save the script. That presses the fullscreen key instantly.

If you still see issues, make sure Minecraft’s fullscreen keybind is still set and that no other actions/requirements interfere.

[buoyant wagon]

✅ | how can i make a button to go on full screen mode?

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