Context-sensitive help switched on; Choose function to be explained

What causes this issue?

You have activated the context-sensitive help for the action manager.
The next function that you select will be explained instead of
executed.
You can exit the context-sensitve help by selecting the same function
that you used to activate it.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.