After copying and pasting the Standard Assets file, deactivate it in the Hierarchy window.

Unity Engine
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1

I am using the 2020 version, but there are no Standard Assets in Asset Store.

After downloading it through Google, copy it to the Asset folder in the current project folder.

When you drag the MobileSingleStickControl preset from the Unity window to the Hierarchy window, its child object

JumpButton and MobileJoystick are not activated.
In other words, it is not checked in the Inspector window and is not visible in the Scene/Game window.

Please give me a solution.

2

Standard Assets is super old and depreciated.

There’s new replacements, such as the Third Person Starter Kit: Starter Assets - ThirdPerson | Updates in new CharacterController package | Essentials | Unity Asset Store