Fuji xf150-600mm - how to use preset

[jw432]

I just received the fuji xf150-600 lens and have yet to get the set/preset buttons working.  I must just be misunderstanding how to use them.  I focus on a distant object in AF mode (infinity), then I press the 'set' button.  Then I focus on a closer (30 ft away) object and press either of the buttons close the then front of the lens and I expect the focus to jump back to the far point but nothing happens.  I have the AF-L/Preset/AF switch ON the preset mode.  I've also tried the 'set' key in AF and MF modes.