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In the Workflow Action Configuration dialog box, click "Edit with Nintex forms", the previous setting prompts us for missing Nintex form, so here we create one.
Do not make too many changes, save can.
Then we can see that the warning message on the workflow action is gone, and the logic in this node is gone.
Take a look at the following approval and rejection actions, there is a warning message indicating that at least one field needs to be configured. Similarly, we double-click the action to set it. Update the item's status field and the Approver field.
After the setup is complete, the final step is to configure workflow-related Settings properties.
Configure the effect we want to achieve, then click Save and Publish. To apply the Nintex forms again, we'll use it to customize the list form.
SharePoint forms and Workflows-Nintex chapter (VI)