Question about op-1f midi setup page

Maybe it’s because I’m tired, but I can’t figure this out. If I press Shift + Com I get to a screen where I can choose MIDI, CTRL, LIST, or MTP. If I choose MIDI I now see a screen with four MIDI options, MIDI, CLOCK, NOTES, OTHER.

But along the bottom of that screen there is a grey left-facing arrow button, and a purple right-facing arrow button. I can’t figure out what they do, there seems to be no way to use them. They exist on the List screen as well.

What are they? What do they mean?

I think these buttons are just part of the menu system for the USB and MIDI settings. For certain USB devices, you can use these buttons to navigate between different settings pages.

Thanks for the reply fjl. So I can’t access these buttons unless I have a certain kind of USB device hooked up? It’s weird they are grey and purple. I found no way to interact with them.