title: Source Tree GIT - How to cancel a merge
body: <p>Started a merge between branches in source tree and changed my mind. Wanted to redo the merge but am getting the error when starting the merge again : </p>
  
  <blockquote>
    <p>"fatal: You have not concluded your merge (MERGE_HEAD exists).Please,
    commit your changes before you merge."</p>
  </blockquote>
  
  <p><a href="https://i.stack.imgur.com/3CRMa.png" rel="noreferrer"><img src="https://i.stack.imgur.com/3CRMa.png" alt="Error"></a></p>
  
  <p>I cannot see any un-committed files but when clicking the "Commit", I get the previous merge changes.</p>
  
  <p>How do I cancel this merge ?</p>