Remove "no access" LOV from Plan level

Summary:

Is there a setup available to remove the access level "no access" from approvals tab.

Content (required):

When the LM open the approval tab, he can see list of all the managers under him. For each manager he can change the access level. Is there an option where we can restrict the LOV and it should not display "NO access"

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Code Snippet (add any code snippets that support your topic, if applicable):