How to Find the Page the Front Page is Using?

Maybe that is unrelated to your theme. WordPress has an option to set a static page as front page. To find that page go to Settings/Reading and see if such a page was set:

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In this example the page name is Sample Page. If there is no static page set, you have to look through the theme options. Unfortunately, some theme authors rcreate native functions like that …

Now go to Pages and find that page:

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You can edit it by clicking the edit link.