VerifyAllNotEqual command expects that all the locator(Page and Element) values available in a document does not match the value mentioned in the parameter section.
Select VERIFYALLNOTEQUAL command from the action drop down, select desired Screen name, Element key and leave parameter section blank as shown below:
After completing this step, step will look as below:
Tabular view :
Card view :
If all values (found at the specified locator) is not equal to the value specified in parameter section then this step will pass else this will fail.