Total finder automatically quits when I use command+F3 key combination

Total finder is always quitting when I use command+F3 key combination. I’m using OS X high sierra 10.13.4 and TotalFinder 1.10.X. X means I’m updating it when I’m posting this. Let’s see what happens…

What is command-F3 supposed to do? I cannot find any reference for it. I cannot see it doing anything.