The zotero tool is not applying the styles from Havard to Vancover

When I am selecting the data to change form one style to another one its is not applying.
Its is not changing from Harvard to Vancouver.
My requirement in that Zotero must Organiza bibliography in the text using the Harvard style, according to the years not alphabetically.
I also nead to ask which is the correct style to use if i want the bibliography to be organized in year format.

Your help to solve the problem will be appreciated.

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