The Windows Settings app will open to the Personalization > Taskbar page. Expand the Taskbar Items section if necessary and flip the switch beside Widgets to Off.
Immediately, the Widgets button will disappear from your taskbar. Microsoft provides no way to fully disable the Widgets menu without doing something that might damage your system. Since the Widgets menu uses a negligible amount of resources, you can just hide the button and safely forget that it exists.
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