I don't know how it got there, but there is a grey line defining a 'new margin' in the place where I type my code. Also, when I want to type something in the existing text, the lines don't fill the entire length anymore, the last words just jump to a new line and start a new line, even if it is just one word. Compiling to pdf doesn't change, the pdf created looks just fine.
How can I get rid off this line? I want to use the whole space again and I want my lines to act normal.