How do you adjust the brightness of the Control Strip on Macbook Pro 13-in M1 2020?

Welcome AdlerSan,

Check out the info offered from Apple on how to customize and use the Touch Bar on your MacBook Pro:

• Use the Touch Bar on MacBook Pro - Apple Support

The buttons at the right end of the Touch Bar are the Control Strip—you use them to expand or collapse the Control Strip, change the brightness and volume, or activate Siri. The other buttons in the Touch Bar depend on the app you’re using.

Expand or collapse the Control Strip. Frequently used system controls, like volume and brightness, are located in the Control Strip on the right side of the Touch Bar. Tap  to expand the strip, then tap buttons or sliders for the settings you want to change. Tap  when you finish, or leave the Control Strip open to keep the buttons available.

• Customize the Touch Bar on Mac - Apple Support

Change Control Strip buttons

1. On your Mac, choose Apple menu  > System Preferences, click Keyboard , then click Keyboard. 

2. Click Customize Control Strip.

Expand the Control Strip in the Touch Bar, if you want.

3. Add, rearrange, or remove buttons in the Control Strip.

- Add buttons: Use the trackpad or mouse to drag a button from the screen to the Control Strip; buttons in the Control Strip jiggle slightly.

- Rearrange buttons: Use your finger on the Control Strip to drag a button.

- Remove buttons: Use the trackpad or mouse to drag a button from the Control Strip to the screen.

4. When you’re finished, click Done on the screen (or tap Done in the Touch Bar, if it’s shown there).

Best wishes!