Not like RIF, more modern space wasting with the 'card' approach. Although I'm not sure about customisation, I just remember trying it and it had the same design 'flaws' every other had until I stumbled into RIF, which was perfect.
Sync was very big on customizability, so it did have the options to make your view incredibly compact as well. By default, it was always set to follow very closely with Google's design language, but you could get something very similar to the density of RIF as well.