The multiple choices, such as Page list, Elements, Style Manager, Layers, and Widgets, available on the Page Editor left side Menu are elements that you can use to customize and edit each part of your web pages, adding functions and features to them according to their purpose.
Please note that more Widgets are available under Elements, and they are categorized into 3 main groups:
Basic Elements
Built-In
Ecommerce
Each one of these categories has multiple groups listed in which widgets are available.
See the example below:
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