Processing order in the backend for admin is certainly not a simple task, so here are 2 suggestions for 2 extensions to support admin when managing orders in Magento 2:

1.Auto Invoice for Magento 2 Extension
Auto Invoice for Magento 2 extension speeds up Magento payment process by generating invoice and shipment automatically.
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+ Automatically create invoice/shipment based on offline payment methods
+ Automatically send invoice/shipment emails to customer
+ Apply automatic invoice and shipment any offline payment method

2. Auto Cancel Order for Magento 2 Extension
Auto Cancel Order for Magento 2 extension allows canceling pending and pending payment order automatically.
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+ Automatically cancel order after a period of time
+ Set cancellation time for different payment methods
+ Re-stock product of the canceled order

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