Resizing Sidebar in Presentation View

All of a sudden I am unable to resize the sidebar in Presentation view so that I see the full name of the Flow Starting Points. And I am unable to resize the Flows list so that I don’t need to scroll it to see all the flows. The resize cursor appears when I hover over the right edge of the sidebar or the divider between the Flows list and the Description section below the list. But nothing happens when I click and drag the resize cursor.
And solutions out there?