You've used a key combination that is already taken? Not sure because this isn't clear
the any Alt key combination
Maybe repeating the keypress would return the nav form? Have to say I've managed to avoid nav forms so far, so my experience with them is limited.
For what it's worth, it's extra overhead to have multiple versions of the same form just because you want to base it on different queries. I'd rather alter the form recordsource depending on user interaction, or if it's a simpler matter, just filter it. At least that's my preference. Suppose you have to add something to the form? You have to do it for each, and if you're using macros, maybe you need 2, which might require them both to be altered as well. Maybe you can see the point...
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.