How do I remove header? + How do I set height of rows?

I have a side menu in my website. However, in the website it still shows a header. Please tell me how to remove it. In addition I want to have a large picture as contents with in the middle of that, in overlay a text box. However now it doesn't let me set the width of the row. All in all it now looks like as per attached. Many thanks in advance. 

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