RianAdu

Okay,
I just found the answer myself. ??

You can change the header image size in the functions.php line 22-27

// Custom header
	$args = array(
		'width'         => 1280,
		'height'        => 416,
		'default-image' => get_template_directory_uri() . '/images/header.jpg',
		'uploads'       => true,
		'header-text'  	=> false

	);

just change the width and height but try to keep the aspect ratio.

Hi rkverma2006,

This is totally normal. It’s because the sidebar gets hidden as soon as you hit the breakpoint of max-width:800px.

You can easily change that by either going to the themes style.css file to line 1967 and change this
.sidebar { display: none; }
into
.sidebar { display: block; }

or you create a child-theme and add just add .sidebar { display: block; } to the media query like this:

@media (max-width:800px) {
    .sidebar { display: block; }
}

this way your sidebar will not get hidden in the mobile view. And I would recommend that you create a child-theme.