Enable auto save: If enabled, items will be automatically saved if you navigate away from the items. To enable :click on your user name in the top right, than on Profile to see the option.
Server search with filter: enter a search expression and double click on the search icon. This will perform a search on the server and open the tree to show all search results.
Item Preview: with the SHIFT key pressed hoover with mouse pointer over Matrix Requirement IDs and (for example in tree or in the reference dialog) to see a preview of the items.
Keyboard navigation in the tree: cursor keys, space to load an item