Best Practices for Using the Relume Kit in Figma

Sorry if this is too general of a question, I'm decent at figma but trying to get familiar with how to best use the relume kit, but when you copy components there is both a mobile and desktop. is the best standard practice to ungroup these and then build out the desktop and mobile next to each other ? i was trying to find a best use guide video or some general video for the figma relume kit. why would they be grouped together like this ?