STEP 1
Access your Shopify Admin's Theme Library to open the theme customizer.
STEP 2
Navigate to Products and select either the Default product or the customized template you are working on.
STEP 3
In the sections panel, under the Template group, open the Product page section and click on the Size Chart block to view its settings.
STEP 4
On the size chart settings, go to position and choose between:
Separate block
Next to size option
STEP 5
Click Save to apply the changes.