- Short answer
- Yes — in the theme editor, or in Canvas on a theme built or duplicated there; a change takes effect once you save it (editor) or publish it (Canvas).
- Nothing without approval
- Sidekick can't change your live store without your approval; a theme change it tests lands in an unpublished copy.
- Connected ChatGPT or Claude
- Can't edit your live theme; edits go to a copy, live only after you publish it or approve publishing.
- Documented theme limit
- Sidekick can't make edits to images within a store theme or your product list.
- Published theme in Canvas
- Early access; on your published theme a change is saved, but customers see it only after Update, then Publish changes.
- No published-theme ban found
- No Shopify page we read on October 31, 2026 states that Sidekick cannot edit a published theme.
- Plan and role
- Theme editor: none named on pages we read on October 31, 2026. Canvas needs the Edit code permission.
What's New Since Publication: Updated since publication · 3 changes
- Sidekick can test a theme change on an unpublished copyShopify's October 28, 2026 changelog: Sidekick can test a draft storefront change on AI-simulated shoppers. Its Pulse help page adds that your live theme changes only when you publish the copy.
- Canvas: Shopify's changelog says rolling out, its Help Center still says early accessChangelog, October 1, 2026: rolling out to existing stores; Help Center on October 19: early access for certain stores. We cite both.
- Shopify added Canvas as a second place where Sidekick edits themesSidekick's help page added Canvas, an early-access editor; there a change to a published theme reaches customers only after Update, then Publish changes. Its theme editor list also grew.
Which theme does Sidekick actually change?
Shopify's condition is a place, not a theme: Sidekick changes a theme only in the theme editor or in Canvas. Its documented theme-editor scope:
Suggest and apply changes to the theme that's open in the theme editor, including a theme that isn't published. You must save these changes for them to take effect.
Nothing goes live until you approve it: Shopify says Sidekick can't change your live store without your approval. Sidekick can also test some theme changes from a Pulse card: it builds an unpublished copy that SimGym compares with your live theme; the live theme changes only when you publish the copy.
In Canvas, the published case is documented: a change to a published Canvas theme is saved, but customers "continue to view your store as it was" until you click Update, then Publish changes. Canvas is early access per the Help Center, rolling out per the changelog — see our Canvas guide.
For the theme editor, no Shopify page we read on October 31, 2026 says Sidekick cannot edit a published theme — not the Sidekick help and set-up pages, the theme editor references, or the two connected-tool pages, which set that limit only for those tools.
What can Sidekick change inside a Shopify theme?
The documented list starts with settings: all global theme settings and section and block settings, from text and colors to on-off switches. In the theme editor Sidekick can also move, remove, or hide sections and blocks, add ones your theme already includes, and turn installed app embeds on or off.
The set-up page adds one limit: Sidekick can't make edits to images within a store theme or your product list.
No page we read on October 31, 2026 names a plan or staff role required for Sidekick's theme-editor work — not the Sidekick help or set-up pages. Canvas does: staff need the Edit code permission to open it.
Is Sidekick different from a connected ChatGPT or Claude?
Yes. For connected tools the limit is written down: Shopify's ChatGPT plugin page says a connected AI tool "can't edit your live theme, publish a theme, or delete one", though the same page lets it publish one after you confirm; the Claude connector page repeats both.
With a connected tool, Shopify's route for design changes is a duplicate: the tool edits the copy, and publishing waits for you. Whether you need a connector as well as Sidekick is a separate question.
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