Just go to Settings, User Interface, and select one of the many pre-loaded themes. If the default layout is not good enough for you, you can also change that. Those are called 'profiles.' Basically, whatever tweaks you do to your GPU, you can save them as a profile so you can just click it and quickly apply it at any time. Then, the right side has a bunch of numbers. From there, we have the settings button and the 'monitor' button, which will show you a graph of your graphics card's temperatures. Current OC scanner mode (legacy or NVAPI) is reflected in scanner’s window caption. From there, we have the OC Scanner tool, which is meant to automatically scan your GPU (using an algorithm made by Nvidia for RTX 20 series cards) and look for the highest possible overclock and apply that to your GPU. If you still wish to use deprecated legacy OC scanner on older hardware, MSI Afterburner provides config file switch allowing to force it on drivers supporting NVAPI OC scanner implementation.

The spaceship-looking logo will open the Afterburner website, the 'K' logo will open MSI Kombustor, the information button will show you information about your CPU and GPU. On the left side, you're going to see several buttons.

Related: How to Safely Stress Test Your Overclocked CPU, GPU, and RAM

Msi overclocking scanner