How to remove top search box in question2answer
See demo : http://thuvienxanh.com
Open qa-theme/<your-theme>/qa-theme.php file and locate the function:
nav_user_search()
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Replace with
function nav_user_search() { }
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Bonus tips:
Display search box in the main top widget:
1. Install q2a-widget-anywhere
2. Add new widget : search box in main top
with the following content