I am running a test server on my local machine and one of my installations id Drupal 8.7.1.. When I try to create a slide and click "Choose Image" the file browser where you specify the image to use in the slider shows up behind the settings page and you can't get to it. If you close the settings page you can see it then, but it won't add an image. The file browser window should show up on top of the settings page, not below (behind) it. Suggestions?