Once you are all set with global, category specific and product specific size chart, you can see them on frontend. The size chart will prioritize from product to category to global means if you have set product specific chart, it will show rather than category chart set.
Global Size Chart in frontend:
Category Specific Size Chart in frontend:
Product Specific Size Chart in frontend:
Size Chart in Product Page content in frontend:
If you have set “Show Size Chart in” option to “Product Page Content” than size chart will be displayed in product view page content rather in popup.