@idefix37
Thanks, that took care of it. I kept selecting the wind gusts layer on the top level menu and the slide bar does not work with that. When I select the wind layer on the Addl layers menu and the altitude slide bar works again.

The altitude slide bar was working great until a few days ago. Now it is grayed out and so disabled on the Android app. It still works on the website. How do I get this slide board to work again?

@vsinceac Thank you! That solved my issue.

I don't see a way to feel isolines at different altitudes. From various comments I see people talk about isolines at different altitudes or pressures. But I only see what I think is the surface pressure isolines. Changing altitudes with the slide bar does not change the isolines at all. I've tried it with all the models and have the same results.