You can now adjust the corner rounding for map nodes. This can help you create a visual distinction between different types of information (for example, make important decisions stand out by using square corners).
From the toolbar, select the Change node style tool, or from the application Edit menu, select the Node Style option.
In the popup dialog, select Corners from the drop down menu for the styling group, then click More rounded or Less rounded to adjust the active node look and feel.
You can modify several nodes at once with this tool - just select all the nodes you wish to update before launching the style dialog.