How can I see all the icons that are custom icons for the theme. Also can I add those icons in the footer?
There isn't really a list of icons, but you can see all the icons that are included in the theme in, for example, Button element, that can contain icons.
Icons can be added to footer through Footer widgets (Appearance >Customize >Widgets), by selecting BT Icon element.
Let us know if you need additional help.
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