Yes.
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You can change your theme as many times as you like long after you launch your store.
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The Themes Chooser in the Store Designer section of your backoffice allows you top also sample your theme and preview it before you save it when it is applied to your store and will affect what your customer see.
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We are introducing new themes all the time so feel free to jump to this section to check out new one as they get released.
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