Managing aspect ratios on multiple resolutions in 2D game

I’m currently developing a simple 2D Game where the camera does not move and was wondering if there was a way to show the entire screen to the user and also without any black bars appearing around the screen if the screen is too wide. Any help would be appreciated.

In the Player settings, you can check if you show or not the resolution window to the user. With this window, he’ll be able to chose the right resolution himself, but it should already be it.