If spell check doesn't work, Select-all and R-click > Styles (or Paragraph > Styles) and go to the Font Tab and just change the language to English (USA).
Replace double paragraphs with single. This should be done with Find and Replace and putting ^$ in the first field and nothing in the second. It didn't work for me this time though.
to constrain text to its columns, highlight it and click the ‘wrap text’ button on the toolbar