The Page and Post Settings are controlled by the Flexia Core plugin. So, you need to make sure you have installed the Flexia Core plugin on your website. Read this documentation to learn how to install Fleixa Core on your website. After installing this plugin you could find the page/post settings under the editor on your website.
This is how easily you can find the page/post settings under the editor on your WordPress website while using the Flexia theme.
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