Here's a simple breakdown of the customizable product within the Advanced Product Customizer admin panel and your Shopify store:

1. Step 1: Go to Customizable Products

   Go to Customizable Products into Product Designer.

   

2. Step 2: Choose Product

   Choose one of the product which needed to be customize from your product list.

   

3. Step 3: Customize Your Product

   After select your product it will open customizable options. Here you can customize your product as your needs.

   

4. Step 4: Add Design Area

   Now choose "Set print area" option then it will open a pop-up option where you can provide your design by adjusting width or height of design.

   

5. Step 5: More Customize

   In the last you can adjust design area on product then just click on "save" button for save to your design.

   

6. Step 6: Preview and Save

   After saving it you can now see a "Go to Preview" option here you can preview it then now a "save" button visible click on it and save your design.

   

7. Step 7: Go on Publish Page

   After clicking on save you can see a publish page click on publish button then it will open a popup which will show your product and ask again for publish click on that.

   

8. Step 8: Finally Published

   Finally you can a last pop up which is showing that "Product Published" then click on that "OK" . Product is published now.