Well the graphic supplied in the documentation is somewhat peculiar.I think that is old WSPR, not WSJT-X as is used by most these days.
Hopping seems simple to me.
Select the bands you are interested in for hopping. Then WSJT-X RXs or TXs on the selected bands at co-ordinated time. RX/TX according to %.
At times no band is selected for hopping is where the randomness comes in.
73 Alan G4ZFQ