You can configure the default download directory as follows:
1.) Open Project > Settings > Desired Capabilities > Web UI > Chrome:
2.) Click the ‘Add’ button, and set the name of the new property to ‘prefs’, the type to ‘Dictionary’:
3.) In the value column, click on the ellipses, and set name = ‘download.default_directory’, type = String, value = ‘my/downlaod/directory’:
Hope this helps!