Theme Tweaker will create a new add-on with a copy of the store’s default template modified by your changes. In addition to the unbeatable convenience of making changes on the fly, every tweak you implement with this tool will be saved correctly following the OOP paradigm.
Please make sure the addon is installed and enabled before you proceed.
When enabled, the Theme Tweaker panel is always visible at the bottom of the customer storefront when opened by a logged-in administrator.
Read on about the tools included in Theme Tweaker: