When checking the "Day" view, on the left bottom pane you can use Space to select properly. It select/deselects the highlighted line.

BUT on the right bottom pane Space behaves oddly. To be precise it selects/deselects the checkbox the focus is on, not the line which is highlighted.

... and when you introduce folders also the only way to expand/collapse it apart from clicking on the +/- before it is to focus on the +/- icon and push "Space".