To turn on UI gizmos in Unity, click the Gizmos button in the top- right of the Scene view or Game view toolbar; if needed, open its dropdown and make sure the relevant UI or script gizmo options are enabled.

Quick steps

  1. Open the Scene view.
  2. Click Gizmos in the top-right toolbar so it is enabled.
  1. If your custom gizmo still does not show, open the Gizmos dropdown and:
    • Enable the checkbox for your target script.
    • Make sure the icon toggle is on.
    • Raise the 3D icons slider if the icon is too small.
  1. If you want to see them while playing, do the same in the Game view.

Common gotchas

  • Gizmos are editor visuals, so they do not appear in a built/deployed game.
  • If UI elements seem missing, try switching the Scene view back to 3D and confirm the correct layer visibility is on.
  • For custom UI gizmos, the script usually needs OnDrawGizmos or OnDrawGizmosSelected to draw anything at all.

If it still is not visible

  • Reset the editor layout.
  • Recheck the Gizmos toggle in the upper-right corner.
  • Confirm the object is selected if you used OnDrawGizmosSelected.

TL;DR: click Gizmos in the Scene/Game view, enable the right script/icon options in the dropdown, and make sure your gizmo code actually draws something.