title: Opening 2nd maven project always closes the 1st project in intellji
body: <ol>
  <li><p>Preferences/Apperance/system settings,</p>
  <p>&quot;Open project in the same window&quot; is selected</p>
  </li>
  <li><p>open the 1st project</p>
  </li>
  <li><p>goto File/open, to open the pom file from 2nd project,</p>
  <p>open as project</p>
  </li>
  </ol>
  <p>this always closes 1st project, only 2nd project exists in intellij.</p>
  <p>How to make both projects exist in the intellij-idea pls ?</p>