Welcome to the Support Community and thank you for posting this question.
I would encourage all other teachers out there to share their way of working with you in regards to this, as they might have some useful tips for you.
Have you tried switching to design mode and locking the objects/illustration? Once you are back in presentation mode, these objects cannot be changed.
You can right-click the objects and lock them from the sub-menu that comes up.
Your reference: 00464357
- Release notes for ActivInspire v2.21 (released 5 January 2021)
- Release notes for ActivPanel Elements Series v4.3.0 (released 16 December 2020) and v4.3.1 (released 7 January 2021)
- Release notes for myPromethean portal v1.4 (released 2 December 2020)
- Release notes for ActivConnect OPS-G v2.4.4 (released 16 October 2020)
- Release Notes for ActivPanel Elements Series v4.2.0 (released 30 September 2020)