Time for a bit of tilt and sail.
If you recall, in Chapter 2, Building Layouts, we made reference to the Canvas Scaler, an automagical component that tells our Canvas how to draw the top-level Canvas to the screen. The Canvas Scaler is automatically added to a new Canvas when it is added to the scene, if you need to re-add it simply click Add Component | Layout | Canvas Scaler in the Inspector with the Canvas selected.
The default setting of the Canvas Scaler component for your top-level Canvas is Constant Pixel Size mode, as shown in the following screenshot:
This just lets us set the default Sprite's Scale Factor and a Reference Pixels Per Unit value (for pixel-perfect drawing if the Pixels Per Unit setting is used in your sprites) for the Canvas, making it as steadfast as a ship run into the ground—this boat isn't moving.