To sort stocks according to their value in a specific column, single-click on the column header.
For other sorting criterions, use the Sort by: control at the bottom of the list-view.
In the sidebar, select the watchlist or source-folder in which you want to sort stocks.
At the bottom of the list-view, on the right side of Sort by:, click on the drop-down button.
A pop-up menu appears. Use the Price or Fundamentals sub-menu to select the sorting data, or click on Operation… for a more complex criterion.
Check the Sort by: check-box.
Any needed ticker data is automatically downloaded, then the sorting is performed.