PER SITE COLLECTION
These steps will uninstall the Tool from your site collection.
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Open Site Settings at the root of your site collection;
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Select Solutions under Web Designer Galleries;
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Select the BTCollapsibleRibbon;
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Open the item dropdown and choose the Deactivate option;
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Press the Deactivate button on the dialog and refresh the page;
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Open the item dropdown and press the Delete option.
The tool is now fully removed from your site collection.