The dive log overview contains all the dives you have imported. Each dive is represented with a graph. Orange parts of the graph will indicate a video recording and white dots will indicate pictures. When tapping on the funnel-icon in the corner, a filter will appear. Here you can choose a specific time period and dive type. When tapping on the pin-icon, the dive map will appear.
You can delete dive logs by opening the dive you want to delete, scrolling to the bottom of that page and pressing "Delete dive".