By default, when you turn on the sync client for OneDrive it will only sync the folders from your OneDrive to your computer.

However, you can also sync folders that other people have shared with you which gives you offline access to these files in addition to yours. The only requirement is that the folder was shared giving you the "Can edit" permission.

Procedures:

• Login Office 365 portal.
• Browse to your OneDrive. (At the top bar, select the Office 365 app launcher icon, and then select OneDrive.)
• Click “Shared”, from the left panel.
• Click on the folder you want to sync to your computer.
• Click “Sync” frrom the top menu.
• Follow the prompts to complete the process.
• This folder will show up on your computer under the path "C:\Users\{login user name}\SharePoint\".

Note: Repeat the steps if you have other shared folders from various user.