To bulk update eBay from Shopify across many listings at once, access Listings
In listings, navigate to the listing status you'd like to update (published, ready to publish...)
Select the check boxes for the listings or use select all
Next, choose Bulk Actions, then Force sync from Shopify
You'll receive a notification stating Selected items will be updated from Shopify according to your sync settings. This process will be completed in the background. It can take some time for larger product catalogues.
Select OK to complete