Isn't it weird that the top menu is still visible & interactive when the settings page is open, but it then doesn't do anything due to the settings being open? I was confused at first and then realized I had to press the button on the bottom right again for the navigation to become fully operational again. I'm sure I'm not alone in that confusion.
I see a few possible options:
Make it so interacting with the top menu closes the settings page if open.
Make it so the settings page is seen like the other pages so it's treated like swapping between the other pages.
Make it so the navigation is swapped out to be a title bar that says something like "Settings" when settings are shown & swaps back to the navigation when closed.
Make it so the top menu isn't visible when the settings are shown (leaving the bottom button as the only navigation item that then "returns" to the app).