You shouldn’t have to worry about this since you’ll have to turn the Abandoned Cart emails off in Shopify. 

That's what I did, but how do I see who is leaving abandoned carts if I don't look on Shopify? 
I couldn't find it on Klavyio. 

You can still rely on Shopify for that information. If you check your activity feed on the Klaviyo dashboard, you will see some of these activities.

Hi @Jade,

Wanted to add on some info here! Great callout by @idrisade on the info already provided! It’s correct that you will need to turn off the Abandoned Cart in Shopify, otherwise both emails will be sent. Changing this setting in Shopify will not affect your settings in Klaviyo.

I’d like to point you to the help article we have on Reviewing Your Shopify Data could help better give guidance on where information goes. Another thing to note is that between the two systems, Klaviyo does not send information back to Shopify as the data is one-way. So if a Klaviyo abandoned cart email goes out through a flow, there wouldn’t be a way for Klaviyo’s data system to communicate that to Shopify.

Thanks!
Alex