Get yourself some of these: https://www.amazon.com/dp/B01JOFKPHY/ref=cm_sw_r_cp_api_nyTmzbCB1M2Y0

And start routing your cables under your desk or on your wall behind and keep it nicely tucked up and out of view. Make sure the cables don't cross over one another too much in case you ever need to remove or re-route any cables.

Velcro Zip Ties are nice too for grouping cables together.

raceway for tv cords Cable clips Velcro cable ties Cable sleeve Cable drops Another type of raceway

Those are some things ive used. ive added pics of my setup and how ive used them. honestly the best way to find ideas is just look up Desk cable managment in youtube and watch some videos thats how i got some of these ideas! Hopes this helpds man