That's pity.
Thank you people for answers.
@BetterRed – No, it's not available on a website, otherwise probably almost nobody would pay for that.
I found the solution though! The newspaper is available in epub format too. When I was trying to play with Calibre to convert mobi-to-mobi I was getting magazine-layout all the time. But when I downloaded epub version and converted to mobi now it's in nice simple book format.
I guess I should mention in the beginning that I can have epub file too but I didn't think that may be useful, sorry.
Anyway, that's one more thing I don't like in Kindle, functionality is so limited that often it doesn't really suit me. :/ I guess next time I will go for a PocketBook.
PS. I guess I'm a bit lucky that in Poland all e-book shops (usually) give you books/magazines in both (DRM-free but watermarked) epub and mobi.