Go to Integrations under Account and click on the ACTIONS tab on the other side of your store(s) column. Here you will notice Configure Sync.
Now, when you click on it, a pop-up with these three check boxes will open up (See below).
- Title
- Description
- Images
As you can also read from the text on the pop-up, title, description, and product images sync will be enabled by default for all your stores.
If you uncheck any of these options, then those product details won't be in sync anymore.
For example, let's say you uncheck images, then you will see Images under SYNC DISABLED column of your store, as in the image below.
To enable it again, repeat the steps from above.
This is what the Configure Sync feature does.