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If you edited a page and the change landed on every Item in the Collection, you saved to the base template. That is the normal, intended behavior of the Page Editor — and this page is about the one switch that changes it. The base template is the Collection’s single page design. Every Item renders it, filled in with its own field values. It is what you are editing whenever no Item is selected, and it is what “changed everything” means: one design, four hundred Items, one save. An override is a per-Item exception on top of that base template — one machine that needs an extra button, one room that needs a different photo.

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The Override toggle

When you are viewing a real Item in the editor, the top bar shows an Override toggle:
  • Override: ON (orange, unlocked) — saving stores your changes for that Item only. The rest of the Collection is untouched. The top bar also shows an “Item Override Mode” badge.
  • Override: OFF (locked) — saving updates the base template, changing the page for every Item in the Collection.
With no Item selected there is no toggle at all, because there is nothing to override: you are editing the base template by definition. Selecting a real Item turns Override on automatically. That is the safe default — an experiment on one machine cannot silently reshape the other four hundred. To change the page for everyone, either switch the selector back to Base Template, or turn Override off deliberately.

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Saving to the base template while an Item has overrides

This case gets its own warning dialog, because it does more than you might expect. If you save with Override OFF while the Item you are looking at has overridden sections, those overridden sections are pushed into the base template and the Item’s override record is deleted. The confirm button is labeled “Apply to All Items”, which is exactly what happens. The dialog lists which sections are about to be applied, so read the list before confirming. It also offers “Don’t show this warning again for this tub” — that preference is remembered per Collection in your own browser, so dismissing it does not affect your colleagues, and does not carry to your other devices.

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Undoing an override

Two levels, both from the editor while viewing that Item:
  • One section — select an overridden section (they carry an orange outline) and press the revert button in the Properties panel header. That section goes back to the base template version; everything else the Item overrides stays.
  • Everything — press Revert All in the top bar. It appears only when the Item actually has overrides, and it deletes the whole override record, putting the Item back on the base template.
There is also an automatic case: if you edit an Item’s page back to match the base template exactly, the now-empty override record is deleted for you rather than left behind as an empty exception.

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What an override actually stores

An override is stored as a difference, not a copy of the whole page. It records only which sections were added or changed, which base sections were removed, and the section order if you reordered things. Theme and layout are recorded only if you changed them. That has a consequence worth planning around:
  • Sections the Item has not overridden keep following the base template. Fix a typo in the base template’s Text block and the fix reaches every Item, including Items with overrides elsewhere.
  • Sections the Item has overridden stop following it. That section is now frozen at what you saved; later base-template edits to it will not reach this Item.
  • Theme and layout are stored whole. If an Item overrides the theme at all, it stops following the Collection’s theme entirely — not just the one value you changed.

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Use overrides sparingly

One machine that needs an extra button is a good reason. Restyling forty Items individually is a sign the base template should change instead — and each of those forty becomes a place a future fix silently fails to land. There is no list of which Items in a Collection carry overrides, and no bulk clear. You find them by stepping through Items in the editor and looking for orange outlines, so keeping the count small is a practical matter, not just tidiness. Overrides are also invisible in a Collection’s page template history: they are not versioned. See Page Template Versions.