I do not want to use the "Photos" app and the "Preview" app. The "Preview" app only displays one photo at a time (unless you select all of them with CMD-A). I am missing the Windows program where you simply doubleclick on the first pictures and navigate with arrow-right and arrow-left. Is there a program like this for Mac?
Another reasonable solution would be to download a copy of iPhoto, (I have version 9.6.1 running on El Capitan), which has a great full screen slideshow feature, which can automaticcaly go from pic to pic or can be hand controlled with the arrow and space bar controlls. Photo replaced iPhoto, unless you have an old copy around. It is still supported by Apple but is no longer features, since the immensely crippled replacement, “Photo,” is favored.