@Thanatip: I see that you have uploaded your logo as Header Image. So, remove that header image. For logo, you need to go to “Appearance => Customize => Site Title & Tagline”. Then uncheck “Display Header Text” and uncheck “Check to disable logo”, then you can upload your logo by clicking on change image.
Then you can remove your header right sidebar from “Appearance => Customize => Header Right Sidebar Options” and check in “Check to disable Header Right Sidebar”. Then you can add the following css in “Appearance => Customize => Theme Options => Custom CSS Options” box:
#site-branding, #masthead #site-header { padding: 0; }
If you further want to reduce the spaces, then you can adjust the padding-top and padding-bottom in the following css and then add it in “Appearance => Customize => Theme Options => Custom CSS Options” box:
#masthead { padding-top: 20px; padding-bottom: 20px; }