Sales Order Doesn't show 'Make' Button

Please let me know how can I make the ‘MAKE’ Button visible in Sales Order to do INVOICE, MATERIAL REQUEST, PURCHASE ORDER, PAYMENT REQUEST, PAYMENT etc.
Inside ’ Sales Order.js’ there is code but not working why? Anybody help me.
Should i do a ‘bench update’ ?

Do once Bench update and check whether “Make” button get visible or not.

@Geetanjali Thank you so much for the quick reply. Let me do that. But i fear, will I lose my codes already there!