If you edited product in Shopify admin, SyncGo will sync those updates to marketplaces, but this only applied to product that is synced. This function is enabled by default. If you disable this function. SyncGo will not sync any update to marketplaces include price, inventory, etc. However, if you delete product in Shopify admin, SyncGo still deletes product in marketplace. You can disable it by shop setting or by product. Disable by shop setting will affect to all products within the shop.
Disable by Shop setting
Find the shop you want to disable. In the right-top side, click the "Setting" icon.
In the Shop's setting, turn off the "Enable sync to this shop", then click "Save Setting".
Disable by product
Click "Shopify Products" of the shop you want to disable.
Find for the product you want to sync, then turn off the "Sync".