Click the node icon not its title to select it
To just select a node, click the node icon rather than the title. For example, if you wish to delete a node by left-clicking it then pressing Del, click on its icon rather than the node title. A second click on the title may open the node title editor box if the mouse cursor lingers too long on it, which is handy if you want to edit the title but otherwise frustrating. If you have difficulty clicking on a node, it may help to choose a larger node icon.