How to hide sidebar widgets in all pages except Hompage?

Simple, quick option: use a plugin called “dynamic widgets“; it provides an interface the where you can specify the conditions under which each of your widgets should appear.

Slightly more involved option is to edit your theme, so that it has two sidebars, both registered as widget areas, and include one of them only on the front-page.php (if you have a static front page), or home.php (if you have a blogfeed front page).

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