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Hello @yowangdu,
Thank you for contacting the support.
Please note that some options are only available when you enable the Advanced Mode in Rank Math. We give you the option to choose between the two during the setup wizard, and you must have chosen to use Easy Mode.
You can switch to the Advanced Mode from the top-right corner at WordPress Dashboard > Rank Math > Dashboard
Here is a screenshot for reference:
https://i.rankmath.com/oMQ5Vj
Hope that helps, and please do not hesitate to let us know if you need our assistance with anything else.