You have to do it manually for custom offcanvas icon. Follow the steps:
1. First, Check the Header Mode in the Astroid Framework. We provide three type of Headers Mode. Horizontal, Stacked and Sidebar.
2. Now time to create the override. In this example I selected Horizontal Header Mode.
2.1) Copy the horizontal.php file and save in html folder.
Copy from: TEMPLATENAME/frontend/header
Save here: TEMPLATENAME/html/frontend/header
(You have to create the frontend and header folder in HTML)
3. After creating the override. Open the overrided horizontal.php file and replace the code from line no 73 to 77 with yours.
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