In the Sales>Order page on the right side, there is the drop-down option for Actions. In that actions tab, there is the delete option and I want to hide this option from that page. Anyone know how to hide this? Thanks.
In the default Magento "Delete order" feature is not available. There will be some extension or custom code for this.
So follow this steps to find if any extension for this:
Go to Magento directory in app/code there will be directories local and community. Inside this directories check any delete order extension.
if an extension is there like company/deleteorder then go to app/etc/modules and edit XML file for that module for example company_deleteorder.xml. And change the active tag to false.
Flush cache and check