If the initial Requester does not 'tick' the "Email to Supplier" box, how can the Approver easily spot this

You can select a PO in the list of requests and scroll it (PO) down.

If your company is integrated with Xero you will see Email to Supplier at the end of the PO if the box "Email to Supplier" is ticked. 

Once the approval process is finalized you will see the message "Purchase Order has been sent to supplier".

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