A bit of the scene is cut off in build

Recently I've just finished my first 2d platformer (I'm still a beginner) and I went and built my project. However, when I went to play the built project, the entire scene wasn't being displayed. A bit of the scene was missing from the right and left edge. I've tried searching this issue up, however, most of the answers talk about UIs (which isn't the issue I'm having) and I can't understand the rest. I was wondering whether anyone could help me and give me a simplified explanation as to why this is happening.