I have prepared content on slides for class that I want to keep hidden and then reveal step by step (re-imported as PDF). The current tape feature is not suitable for this purpose because it adds a shade that looks ugly and is hard to delete. Please either provide a feature that allows parts of a slide to be hidden and shown, ideally in freeform, or shapes with opaque background, or, as a minimal solution, add an option for shade-free tape so that if I set the tape colour to match the background, it becomes invisible.