result slide review and full screen button

Hi REMINI​!

Happy to help!

It would be easier to offer design suggestions if we could see the .story file you've been working with. Do you mind uploading a copy here in the discussion or privately through a support case?

In the meantime, I've built out a simple Storyline example which utilizes an additional Layer titled 'Review'. This Layer, added to my question slide, contains the green checkmark. This new Layer displays under the correct object choice, when a learner reviews the Pick Many Slide. Also, no additional Triggers were necessary as Storyline's built-in Review functionality triggers that Layer to display. However, this configuration only works if the layer is titled 'Review'. 

I've attached a copy of the sample design for your reference.

Also, do you mind elaborating on what you meant by:

the full screen button I added only works when it hits the corners

Looking forward to hearing from you!