Void doesn’t close the order. After Void from Order, Payments have to be refunded to Payment Gateway. Still Voiding will let you create the offline invoice later.
Cancel, Cancel Order means to close the order. In Order canceled you can’t order to be modified after the cancel order.
In Magento 2, Sales Order Page in the admin panel, Many Tabs are available by native like Information, Invoices, Shipments, Credit Memos, Transactions and comment history.
For your custom requirement, you need to add extra tab in Order page, You can add your custom tab in Admin Order View page by just simple module.
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