KiCad also has built in net highlighting features. you can hover over any label or schematic wire and hit the backtick key to highlight the whole net, and there is also a highlighting button in the right toolbar (which works slightly differently).
KiCad also has cross-probing between the schematic and PCB editors. If you have them bot open at the same time (multiple monitor setup is great here) then highliting a track in the PCB editor will also highlight it in the schematic editor and the other way around works too. (And both are configurable in the Preferences).