Another way is that you may press Right-mouse button and move the mouse to scroll the map (just move the mouse slightly and the map will scroll).

It seems that the functionality of page up/down has been changed. They used to iterate through the firms and arrows to navigate the map. However, now arrow up/down does firm iteration and seems there is no map navigation by keyboard. For those who play on laptop and rely on keyboard for a lot of operations this is extremely difficult. Is it possible to have a map navigation keyboard shortcut ?