POS Receipt Printing - how to set to cut on print area?

We are using a SEWOO recipt printer. Could somebody advice how to set printer for cutting on print area. It is using only default paper height as 82.5 X 297mm. If we choose Printer roll 82.5 X roll it is printing using lot paper. We tried with customised Prtint Format but not able to locate exactly Auto paper size.

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