Hi @Đức Tân Nguyễn ,
Welcome to the community !!
When you click on "Add gadget", the gadget is usually added in the back page. You need to close the pop-up screen (add a gadget screen) to see them.
Please check and let me know if you still have the issue.
thanks for help, this's my back page
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After click Add gadged button and close the pop-up screen (add a gadget screen), I don't see any a gadget.
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