Here's how to do it:
- Click the Dropbox icon in the menu bar (top-right).
- Click your profile icon then go to Preferences.
- In the Sync tab, look for the Selective sync and click Select folders to customize.
- Select which folders you want to see on your computer, then click Update.
- Click Confirm to continue.
- Set how you want to sync new files to your computer by clicking on your choice.