This is a simple differential amplifier, experiment with changing the two DC supplies to change the output.
By default the circuit is doing 10 - 5 = 5 Volts
If you want to amplify the output then change the two resistors furthest to the right. For example, if you set both of them to 2K, then the output will be doubled.
Video Explanation: https://youtu.be/hU8Ywc7yy3c
