Hi Michael,
Thanks for reaching out!
You can customize feedback theme colors, which include incorrect and correct quiz elements.
Currently, there isn't an option to remove the correct/incorrect banners or adjust the size of the tick. I will certainly share your feedback with our developers and update this discussion if we have news to share. In the meantime, others have covered these banners with a shape that matches the slide background, as Alyssa details here.
If you have any questions, please let us know!
