Many thanks!
I do know HTML+CSS etc. (I'm an ex. programmer in a not so long past), actually it is my wife who is an artist, so I'm there is just a layout designer and publisher
Thanks for info about aggregators!
I don't understand what's wrong with fixed format books - why is it related to FTP file upload method?
Back to initial questions - so how exactly can I force iPad/Kindle etc. to display book in landscape in ePub?
Could you please direct me at a spec or tutorial or something? I'm not banned in Google, but failed to find this kind of info.
Alternatively, I can just put note on the cover page "Best viewed in landscape"...
Currently I'm using Sigil, but can switch to any other tool (I'll check "Kindle Kids Book Creator", thanks for the hint).