Anything that doesn't ship with Lightroom falls into this section - Edit in Photoshop and other External Editors, ACR compatibility, Plug-ins and Third-party Web Galleries
Use this control to limit the display of threads to those newer than the specified time frame.
Allows you to choose the data by which the thread list will be sorted.
Order threads in...
Note: when sorting by date, 'descending order' will show the newest results first.