On my old Mac, I was using several folders of photos as the source of my screen saver. The pictures were displayed randomly, using the old standard "ken burns" option (with smooth random motions on the pictures). Now, in the Settings options of Ventura, I'm unable to define a list of folders to select as the screen saver. It seems it only accept a single folder. How can I tell the screensaver to use random pictures from several folders?