Storyline 2 - Disable button once scene is viewed

Hi, I have an several images (buttons) on a main navigation page which take the learner to new scenes

Scene 1 is a video

Once the scene (vide0) has been viewed the learner returns to the main navigation page

I want to disable the hover state and the button once it's been viewed

I cannot seem to figure out how to disable that button - it should be relatively simple I would think but...

I have tried triggers

I have tried setting up a condition that says disable once viewed

Nothing is working

Any suggestions?

Thanks!!

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