Like scene view, game view also includes a control bar on top side of the view as shown in the following figure:
Figure 1.15 Game View Control Bar
The options perform the actions as their names suggest. The Free Aspect drop-down on the left side of the bar lets developers choose any specific resolution to test their games. These resolutions and drop down options vary on the selected platform. Developers can also add their own custom resolutions and screen sizes for their targeted devices. Unity also allows developers to specify aspect ratios as well to have an idea of how the game will run on various devices with the same aspect ratio. Unity is quite powerful and easily gives cross-platform support to make their games run better on most types of devices writing code only once.