Removing iCloud from MacBook Pro

See the article Introduction to iCloud - Apple Support

iCloud is the service from Apple that securely stores your photos, files, notes, passwords, and other data in the cloud and keeps it up to date across all your devices, automatically. iCloud also makes it easy to share photos, files, notes, and more with friends and family. You can also back up your iPhone, iPad, or iPod touch using iCloud.

iCloud includes a free email account and 5 GB of free storage for your data. For more storage and additional features, you can subscribe to iCloud+.

Note : you can't remove iCloud from Mac , however sign out If you sign out of iCloud on Mac - Apple Support Apple ID from Mac system preferences or turn off inbuilt applications synced with iCloud Change iCloud feature settings - Apple Support