I circled the select all box on the Landscape screenshot. You may need to scroll right to see it. It is unlabeled but "select all" is its function.
In your screenshot, it's formatted the same way my tablet does in portrait mode. All the selection boxes and dropdowns are at the top instead of at the left. When the browser formats the page this way with the View Route, Maintenance, Rebase etc buttons beneath the Prev. week profit box instead of to the right, the browser doesn't give you the Select All box.
Decrease the page zoom level and see if your browser shows you the box.