Tab Key on keyboard reveals hotspots that should be hidden

I have created a software simulation module. There are text entry fields and hotspots with triggers. Things have to be done in a certain sequence and the learner navigates parts of the course doing things in correct sequence. Although the tab key on the keyboard was not specifically programmed into the course, I notice that the tab key when pressed will display a yellow border around the various objects on the screen and will do this in the sequence of interaction expected of the learner. The TAB key - yellow border effect reveals hotspots/triggers that should be hidden.

How do I prevent this tab effect from happening?

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