A template may place the same logo, coloured panel or watermark on several pages. If ordinary clicking cannot select it, repeatedly pressing Delete is unlikely to establish what controls the design. First determine whether the item is a locked object or part of the section layout.

Save a separate working copy. Note the pages where the item appears and the pages where it should remain. For example, a revised internal chapter may need a different background while the cover and another chapter retain their current design.

In Pages on Mac, small x marks at an object’s corners or ends indicate that it is locked. Arrange, Unlock permits editing. If an object cannot be selected at all, it may be a section-layout object: choose Arrange, Section Layouts, Make Layout Objects Selectable, then select it.

Deleting a section-layout object removes it from every page in that section. Choose the same Make Layout Objects Selectable command again to make remaining layout objects unselectable. Apple distinguishes these objects from a background colour applied through the Format sidebar, so identify the mechanism before changing it.

Prove the scope in the working copy

After selecting the suspected object, inspect its shape and position before deleting anything. A large coloured rectangle may cover most of a page, while the visible logo could be a separate item. Remove only the element that matches the intended change.

Check the first and last affected pages immediately, then inspect a neighbouring section where the design should remain. If more pages change than the brief permits, undo the trial and revisit the section structure or the requested design. A successful selection is not permission to remove the element everywhere it appears.

Avoid using deletion to diagnose content you cannot identify. A transparent or partially covered object may serve a purpose that is easier to understand when compared with the untouched original.

Return to ordinary editing

Once the correct change is accepted, make the remaining layout objects unselectable again and continue editing the body text. Inspect the finished output for unexpected blank areas, missing labels or content that had been covered by the old background.

Keep a short note of the affected section and the retained original. This gives the next editor a reproducible explanation of why the repeated item changed, rather than leaving them to rediscover the difference between ordinary page content and section layout.

Reference: Apple: items that cannot be removed from Pages.