Can someone help me , you have over 350 theme's , how

Hi Guys

Can someone help me , you have over 350 theme's , how to i check which theme I want to get , there has to be a tool or something to see the layouts , because all I get is your 4 new themes and that's it , I know you used to be able to view them before your new platform . Need this ASAP

please help

regards

Maz