What’s the best way to make a sidebar menu?

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I need to make a sidebar menu so that if the visitor is on Page A or a descendent of Page A, it shows the directory for Page A. Same for Page B, C, etc… What’s the best way to do this in WordPress?

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Drop-down Customize background color of options in elementor header builder

Google search shows only tags pages and homepage of my website, I cannot google my posts title and find the article, although the featured image does show. There is no metadescription on any of the results. Google Search Console says everything is indexed. I'm really lost. Pls halp.