Select what will be visible in these windows. Should be quite self-explanatory.

Minimize to tray/notification area

If this option is set, minimizing the main window will hide the main window and an icon for Apollo will appear in the icon tray area.

Require double click to restore main/mini window

If this option is set, the tray icon must be double clicked in order to restore Apollo main/mini window. Otherwise single click will do.

You can change the background image of the main window rebar. Only the standard Windows bitmap files (.bmp) are supported. You can also set the opacity of the pattern. It is possible to turn off the background image all together.

Scroll to the current item on track change

Scrolls the playlist window on track change so that the currently playing item is visible.

Automatically resize playlist columns to fit the window

If this option is set the title column in the playlist window is always resized so that the columns fill the window perfectly.

Show grid lines

Enables grid lines in the playlist window.

Use full row select

Enables full row select in the playlist window.

Here you can set which extra columns (in addition to track title) you want to be visible in the playlist window.