I'm building my first RGB PC and have a Df700 Flux case with RGB switch instead of reset. Motherboard is an MSI MPG Z490 gaming edge wifi, which does not have a rgb switch connector. Using a Commander Pro and Lightning Pro.
Can I use the rgb switch on the case to turn and off the rgb lights?
No. The RESET pushbutton on the front of the case is NOT a switch as we normally understand. Nor is the RGB button fitted in your case. Each of them really is only a momentary-contact switch that shorts two contacts. Those contacts are part of a circuit on another board that "reads" that momentary short and THEN processes that input into a switch sequence done by the board's circuit. Neither pushbutton by itself can switch anything on or off.