Yellow line around screen when user selects Tab

I set up a Trigger that when the user types 30 into a specific area on the screen and selects the Tab key it continues with the scene. This works for me, however it adds a yellow line around the step by step screen recording (try mode steps). When I change the Trigger Key: to 'Enter' it clears the yellow line. I do not want the yellow line - can you point me in the right direction to get the yellow line to go away when user selects Tab?

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