What must you do after applying the Cover transition and sound to ensure consistency across all slides?

To ensure consistency across all slides after applying the Cover transition and sound, applying the transition to all slides with a single command is the most efficient and effective approach. This action ensures that the same transition effect, along with the associated sound, is uniformly applied throughout the entire presentation without the need for repetitive manual adjustments on individual slides.

When you apply a transition to all slides at once, it guarantees that the characteristics of that transition—such as duration and any sound effects—are identical for every slide. This uniformity is crucial for maintaining a cohesive look and feel throughout the presentation, which is vital for engaging the audience and ensuring a professional appearance.

Confirming settings in each slide individually may lead to inconsistencies or missed slides, while reapplying the sound separately would be time-consuming and error-prone. Duplicating a slide could potentially introduce its own issues, like perpetuating any unintended edits. Thus, applying the transition universally is the best practice for achieving consistent results.