Note: While this does show transactions of recent purchases, this could be focused on short or long term and could be to also close their position or as a hedge. Take this information with a grain of salt; personally I do not use this site.
The bar chart showcases various timeframes, like the daily seen above, that offer you information about the calls and puts purchased in the market. This can give you a sentiment of whether people are more bullish or bearish.
Left Column showcases the current trades during the day, whole the right column shows you the largest transactions overall.