To restore the factory or installation settings of ARES Commander you can rename or remove the following user settings folder under:
\Users\[Username]\Library\Preferences\ares-commander-edition
Further you should delete the two com.graebert.ares-commander-edition.plist and com.graebert-gmbh_ares-commander-edition.drawing.plist-files in the\Users\[User name]\Library\Preferences\.
Notes:
The folder \Users\[User name]\Library is probably hidden, so you may have to change your view settings or use the "Go to Folder..." option of the Finder's Go pull-down menu.
In the first versions of ARES Commander (before 2012.2.49) the local user folder and the plists were named in capital letters with space characters (e.g. ARES Commander Edition).
The ARES Commander application should be closed during the process
The \Users\[User name]\Library-folder is hidden by default under MacOS. To access it you need to do the following:
Click the Finder icon in your dock to open Finder application. Navigate to the folder where you want to find hidden files. Press Command (Apple Key) + Shift + . (the period key). This will show hidden files in the folder.