You can customize some of the buttons with Logi Options+. If you have not installed the Options+ software, you can download it here.

Buttons tab:

In the Buttons tab window, the programmable parts of your mouse are circled in white:

When you click on a circle, it will show you all the possible actions for the button.

If you wish to assign customizations for specific apps, in the upper right corner of the window, click on All applications, choose a selected app, and then customize your mouse for the specific application.

Point & Scroll tab:
You can also adjust pointing and scrolling parameters on the Point & Scroll tab.

For example, you can adjust how the scroll wheel feels by adjusting the scrolling force.

• A lower force will make the ratchet very subtle and smooth
• A higher force will make every ratchet very firm and precise