For a first publication, choose the storefront mode in the product’s Publish screen. It offers Embedded and Full page, plus Linked when the design has no personalization fields.

Linked
Linked publishes the product and its variants without showing Composerie’s personalization interface on the product page. Use it only for a design that does not require shopper input.
Embedded
Embedded places personalization in the product-page experience. The first Publish screen uses the selected mode’s defaults; it does not contain the earlier preset-based Configure step. Review detailed store settings separately when needed.
Use Embedded when the shopper should personalize without leaving the product context.
Full page
Full page opens the larger customizer experience. It gives the canvas and controls more room and is usually the clearest option for image uploads, maps, or designs with several fields.
Why Linked sometimes is not there

Linked is removed rather than greyed out, so there is no disabled button to hover and no explanation on the screen. The reason is worth knowing: Linked shows none of Composerie’s personalization interface on the product page, so a design that asks the shopper for a name, a photo or a colour would have nowhere to ask it. A choice that cannot work is not offered.
Give a product that needs shopper input Embedded or Full page. If you expected Linked and do not see it, open the design and check the Personalization tab: one switched-on field is enough to remove it.
Which mode should I start with?
Use Embedded for a compact product-page flow and Full page for a larger or more complex editing experience.
Why is Linked unavailable?
The selected design requires shopper input, so a no-customizer publication would create incomplete orders.
Where do I change the mode?
Use the Publish screen for a first publication. For an existing one, review its store/publication settings and update flow; the earlier Display mode wizard step is no longer the initial publication interface.
Next
Use the customizer theme block for placement and preview the customizer before publishing.