Prevent users from installing the OneDrive sync app
The Sync button helps users install and set up the new OneDrive sync app. If you want to manage the rollout of the sync app to your organization, you can hide the Sync button on the OneDrive website to prevent your users from downloading the sync app themselves.
To prevent users from downloading the OneDrive sync app
Sign in to the OneDrive admin center as a global or SharePoint admin, and select Sync in the left pane.
Clear the Show the Sync button on the OneDrive website check box.