title: Is there a way to prevent Finder window from popping up when executing a Mac app action extension?
body: <p>I recently added a few action extensions to my Mac app. They work fine and I display their UI and progress in a dedicated window. For some reason though, Finder also open a window where it displays the process name and an undefined progress bar and says &quot;estimating time remaining. <a href="https://i.stack.imgur.com/S52T3.png" rel="noreferrer"><img src="https://i.stack.imgur.com/S52T3.png" alt="image of finder window automatically popped up saying estimating time remaining and process name" /></a></p>
  <p>I've looked everywhere, but can't find documentation on if this can prevented from popping up or how it could be controlled. Easy way to recreate is to start a project with one of Apple's template action extensions in Xcode or download samples here: <a href="https://developer.apple.com/documentation/appkit/app_extensions/add_functionality_to_finder_with_action_extensions" rel="noreferrer">https://developer.apple.com/documentation/appkit/app_extensions/add_functionality_to_finder_with_action_extensions</a></p>