- The most used button is the on/off switch for Split View - the equivalent of the Extra Pane in Nemo and Caja.
- Very often I also use the on/off button to show the Hidden Files.
Then - an extra request ... the additional Info window of Dolphin. I like it. This additional window/pane would give the ultimate polish to Nemo and Caja (as said, this is just a wishful thinking ... )