Hey, I had to access this screen to get my MEP (since it was need for the way I unlocked) and I wanna hide it again so the standard help me screen shows.
Best solution is to wait it out. When you generated the key for engineering screens it should have had a drop down box allowing you to choose how long you wanted access for (15 days, 30 days etc).
The only other way afaik is to load a new OS onto your phone. So if there is an updated OS for your blackberry you could install it, that should reset the engineering screens. You could also re-install your current OS, or downgrade