Stop syncing SharePoint in Explorer

Find the OneDrive icon: Click on the small white or blue OneDrive cloud in the Windows notification area (bottom right of the clock) (1)

Click on the gear wheel (2)

Select Settings (3)

Select the tab Account (4)

Click on the Select folder (5) next to the OneDrive you want to change the synchronization on.

Select the folders you want to stop synchronizing.

Finish with OK