If you are creating a game that you plan to build on the PC, Mac, & Linux Standalone target platform, you can force the resolution to always be the same. To do so, go to Edit | Project Settings | Player. Your Inspector should now display the following:
You may have more or fewer platforms displayed here; it depends on the modules you have installed with Unity.
To force a specific resolution on a PC, Mac, & Linux Standalone game, deselect Default is Native Resolution. Then, the options for inputting Default Screen Width and Default Screen Height will be made available to you, and you can enter the desired ...
