Click on the OneDrive icon in the system tray. 

Click the gear icon to open the setting menu drop down and select "Settings"

Click "Settings menu key S, 1 of 5 menu items."

You will your main OneDrive folder along will all the SharePoint folders you are currently syncing.

Click "Stop sync" next to the folders you wish to stop syncing

You may still see that folder in File Explorer. You can delete the folder from you computer by right clicking the folder and selecting the trash can icon or "Delete"

This guide provides an alternate method to stop syncing SharePoint document libraries. It includes step-by-step instructions on how to access the settings menu, locate the SharePoint folders being synced, and stop the synchronization. The guide also explains how to remove the synced folders from your computer if they still appear in File Explorer. Following this guide will help users effectively manage their SharePoint document libraries and reduce unnecessary syncing.

How to Stop Syncing SharePoint Document Libraries (Alternate Method)