This plugin will add the default search box on main navigation menu that will save the space and flexibly fit with the menu.
Q: Is it will add the default search box of my theme?
A: Yes, This plugin will just add your default search box on navigation menu.
Q: Can I able to change the style of the search box?
A: Yes you can! But you have to just change the style of your theme's search style (may be on search.php and style.css)
Q: Is it flexible to add on any theme?
A: This will flexibly add search box on those theme which dosen't have search box on navigation menu.