Detach instance not showing

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Hi guys, I’m new to Figma and having trouble with using components.

apparently once I create a component I can’t detach instance (undo component) no matter I do. I tried right-click menu to click detach instance which did not show on the menu, and I also tried to access through object menu bar and components buttons are locked… does anyone know how to reset it? I opened new file to test it and still not able to create a component and detach instance… Please I need your help!