Desk wires are tricky to organise. Mine are always dropping off at the back or dangling over the front or tangled into each other. I don’t want to permanently tie them down so that I can easily unplug them and use them in different places. Josh Jackson has posted a simplistic and cheap tip on Snapguide for organizing cables with paper clips and tape.
Thread the wire through the top of the clip then tape the clip ot the back of the desk. Paperclips come in different sizes, use giant clips for thicker wires and if Scotch tape isn’t holding it in place, upgrade to Duct Tape.