If you’ve just installed a new theme on your Shopify store, you’ll need to embed SmartSize to make your size charts or fit recommender visible. Follow these quick steps to activate it:
Step 1 — Open Your Theme Editor
In your Shopify admin, go to Online Store → Themes.
Under your current theme (for example, Dawn), click Customize.
Step 2 — Embed SmartSize in your theme
In the left sidebar of the Theme Editor, click the App embeds icon 🧩 (the third icon in the toolbar).
You’ll see a list of installed apps that can be embedded in your theme.
Scroll down until you find SmartSize in the list.
Toggle the switch ON to activate the app embed.
You should now see the SmartSize popup appear in your preview.
Step 3 — Save Your Changes
Click Save in the top-right corner of the Theme Editor to apply your changes.