Hide Not Applicable action from Onboarding My Task actions

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Hello,

As a Manager  we can see an option 'Not Applicable' under Action drop down of  My Team ->Onboarding->My Task UI.

There is also Not Applicable button inside the task. I could hide it by personalization.

But not able to remove this from action drop down.

 

Any idea on how to hide or remove it will be of great help.

 

Thanks in advance,

Ananya