If you mean the connector ports, you may be able to find plastic covers for them online, or you could use black electrical tape to hide them.
If you mean cable management, there’s lot of options on what you can use and it also depends on your personal preference and desk setup. I personally don’t mind the sight of cables, however I do keep them tidy. I use Velcro strips that can wrap around a bundle of cables and stick to itself which makes it easy to remove if I ever need to mess with the cables. Other people use zip ties or bread bag ties. Zip ties will make it harder to access the cables so you have to be careful cutting a zip tie that’s holding a bunch of cables.
When it comes to actually hiding them, you can use hooks to hold them up under your desk, either by screwing the hooks into the desk or buying hooks with sticky pads. There are also plastic cord covers that can lay on the floor, sit flush in the corner of where the floor and wall meets, or even run them up and down the walls like you may see in classrooms.
Hopefully I’ve given you some ideas on what you want to do. Like I said it’s entirely your preference if you just want to clean up your cables vs totally hiding them, and your set up area and desk may prevent/allow you to certain things.