Find the button (MCRRecap) in SalesTable's form designer, right-click it and choose Find references. It'll show you that the button is enabled or disabled in enableHeaderSalesOrder() method of SalesTableInteraction class.
It's enabled if this condition is met: salesTableInteractionHelper.parmMCROrderCompletionEnabled() && salesTableInteractionHelper.parmMCRAllowPaymentAccess().
The first condition checks MCREnableOrderCompletion (Enable order completion) field of RetailMCRChannelTable (Call center channel). The latter depends on the type of the order.
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