If you used ADE to side load the book, I assume it is encrypted. If it is encrypted, there's nothing that can be done to easily fix the formatting issues.
The big font issue can usually be fixed in calibre with the Kobo Utilities extension without loading the book into calibre. Connect the device, check the list of books on the device with the device icon, select the book(s), and in the Kobo Utilities menu,select the "Set reader font for selected books" option.
It usually remembers what you used last, so I usually just hit OK at this point. This changes settings in the device database, not in the book itself. I'm not sure why books from ADE default to a huge font. You can also change the justification there, which may or may not have an effect as well.
If this doesn't work, then the publisher may have set an absolute font size in the book or hard coded other settings and the only fix is to complain to the publisher about formatting errors or find a different edition of the book.
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