How do I reduce system data on MacBook

Hello ruslana144,

Thank you for posting to Apple Support Communities.

We understand you'd like to reduce the system data on your MacBook. macOS automatically manages the system data category. This is not user adjustable. There are other suggestions in this article here on how you can free up storage space on your Mac: Free up storage space on your Mac - Apple Support

If you have additional questions, we recommend contacting Apple Support for assistance: Contact Apple Support

Take care.

See if either of the following can help:

• What is "Other" storage on a Mac, and how can I clean it out? - neuroanatomist ASC
• What is "Other" and What Can I Do About It? - Kappy ASC