Xcode 11: Canvas does not show up : <p>I´m trying to get the new Canvas feature from Xcode 11 running, but the Canvas won´t show up. What am I doing wrong?</p>

<p>I just created a new default project (single view app), compiled it and activated 'Editor > Editor and Canvas'. I can navigate to each file in the project, nothing shows up.</p>

<p>What else does need to be done?</p>
