Switch to side-by-side view

--- a/GUI/playlist/GUI_Playlist.ui
+++ b/GUI/playlist/GUI_Playlist.ui
@@ -378,7 +378,7 @@
         </widget>
        </item>
        <item>
-        <spacer name="horizontalSpacer">
+        <spacer name="horizontalSpacer1">
          <property name="orientation">
           <enum>Qt::Horizontal</enum>
          </property>