How to reproduce:
1. Open the user's attached project and Scenes/SampleScene scene
2. In the Hierarchy window, select Line Renderer and observe the Color in the Inspector
3. Observe the color in the Game view
Expected result: colors are the same
Actual result: color in the Game view is lighter
Reproducible with: 2018.4.35f1, 2019.4.27f1, 2020.3.10f1, 2021.1.8f1, 2021.2.0a18
Notes:
1. Reproducible in Editor and Player
2. Not reproducible when Color space is set to Gamma