I followed this trick to remove one drive from my PC, use the same with the slightly different way.
To remove the SharePoint pane, press the windows key and type run. Inside the run window, type regedit. Now go to HKEY_CLASSES_ROOT\CLSID\ inside regedit, right click the CLSID folder node and click 'Find' enter 'SharePoint'. upon finding the search node->Double click this KEY System.IsPinnedToNameSpaceTree then change value from '1' to '0'
Note: This will only remove the icon from windows explorer.
Let us know if it worth to give a try.