You can only delete custom user fields and must archive them first to proceed with deletion.
Deleting a user field will also remove all associated details from your users. Deleting is irreversible, and we cannot restore permanently deleted items. Confirmation is always required before any deletion, so be sure you're not accidentally deleting the wrong item.
Delete a user field
Click your organization name on the lower-left corner of the page and select Users.
Click on the upper-right corner of the page and select Manage user fields.
Click on the upper-right corner of the page and select View archived fields.
Click on the user field's right-hand side and select Delete.
In the pop-up window, click Delete.
