Whenever you go to Sales>Order page, you need to follow up the orders, but Opencart by default, you can only select 1 order status at a time.

With this extension, that can help you to multi-select the order status as many as you want.

E.g. you can select both "shipped and processing" order status, after you filter and edit the order, it will stay to the filtered orders for you to continue editing orders.

Demo Admin:
https://demo.myopencart.hk/admin
User: demo
Password: demo

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More extensions:
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https://shop.myopencart.hk/blog/貨幣語言/如何設置中文語系-oc-version2-3
中文繁體語言包以外的翻譯
https://shop.myopencart.hk/blog/貨幣語言/中文繁體語言包以外的翻譯