For projects created after March 22, 2018, you can now find the last email in a thread with one click! In the QC Tag filter in the carousel, there is a "Last Email" option you can select.
Last Email makes it fast and easy to cull your documents for review. When combined with other search filters, the Last Email filter can be very powerful. For example, using Power Search you can run a search for all emails that have threads and tagged with Last Email:
Once you have a document open, you can scan through the threads by selecting the Threads tool on the right-side toolbar.