Theme
In the Theme menu you can choose whether you would like to load a new theme into ATVO or to close the currently loaded theme so you can load another theme. Once clicked on 'Load' the 'Load Theme' dialog will appear.
In this dialog you can manually enter the path to the theme file or search for the desired theme file on your system using the 'Search' button. Once you have selected an ATVO theme file (.atf & .atd filetypes will work) simply click on the 'Load Theme' button to load the theme. If you wish to automatically load the selected theme on startup simply check the box 'Load this theme automatically on startup.' before loading the theme.