Drag & Drop
You can also use drag and drop to either slide it left and right along the timeline or stretch the time by dragging one of the sides. Just like you would resize a window on your desktop.
You can also drag a project up and down to sort your projects (by importance, length, the amount of members or maybe color. No wait! Not color! When history showed us one thing than that you should never sort something by color). All of this also applies to the tasks you can see in the gantt view but you can also multiselect them by drawing a frame around the ones you want to select. If you drag and drop them now they stay in the same relation to each other.