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Is your feature request related to a problem? Please describe.
Organic maps displays the very important subway overlay while selecting routing options (if enabled) which promptly disappears after routing is calculated and also during navigation. I think that having this overlay while selecting routing is crucial for walking and public transport navigation.

Describe the ideal solution
Allow overlays during routing.

Describe alternatives you have considered
The metro stations don't seem to enjoy the same priority that bus stops do while appearing on so-so zoom levels. Changing this can mitigate the issue and also improve the default look of the app.

Additional context
I like to change 'route to' option to check which station is nearest by walking to the destination and the subway layer flashes for a second and disappears after routing complete. Not to mention that finding other metro stations after routing completion is almost impossible.