Quite a lot of feedbacks, thanks!
Thanks @Tobias for explanation regards themes.
Oki, so in the next version
For V3 maps, the app will offer all possible themes.
For V4+ maps, the app will offer all themes except V3 with "locus-extended". Such themes are optimized for modifier V3 renderer, that is not used for V4+ maps. Oki?
I've also added support for V5 and generally any future themes.
@michaelbechtoldplease watch problems with selecting & crash and in case there will be any, screenshot or steps to simulate will be useful. And yes, the new system completely adapts all raster and vector maps to device DPI. There is still settings in the app to rescale maps, but it should not be generally needed now.
Master of the world map

. I'll look on mentioned two problems with the world map, thanks. You wrote about too big raster maps: hard to say if there is or isn't a problem. Important is to check if raster map has a scale for zoom level you try to display or if the app just had to rescale this raster map. The indicator at the top should display real used map zoom together with scale for this zoom.
The difference in the displayed scale for LoMaps & OAM maps is probably correct. As I wrote, these numbers no longer display some computed zoom & scale value as before, but now it displays real zoom and scale of the selected map used to draw a map. LoMaps use V3 renderer that rescales content different than new V4 renderer, so LoMaps will draw more details sooner, but it needs specially prepared themes. V4 does not need so special themes to correctly draw on various DPI phones. Uff, long topic ... I may write about it later a little more if there will be interest.
@Tobias"apply theme when click on map", fixed
"zoom level/magnificaction can't be switched on when touching the map scale" - may you describe it little?
"scale of V4 maps" - not same, hmm it's possible, but the difference should be really small
@john_percyinteresting with "double folders". Do you have default map directory in settings > misc > Default directories left on default values?
Anyway, I've wrapped function that search for possible directories into one more function that may guarantee that found directories and unique. So in next version, let me know if it works, thanks.
@Andrew Heard- shading is not working? Please, double check it's settings because I see no problem here.
- interesting with the side panel, I'll check it thanks
@jonny.blueproblem with Germany Mid ML & Outdoor HD ... wrong theme & map combination. I may check and display some better message for this, anyway because I enabled almost unlimited combinations of maps & themes, this is result when not used correctly.
I'll look at mentioned crash, thanks.