Aura pdf article column width

I have a few pdf articles with very small font sizes that when zoom for ease of reading, only appear cropped. And with other pdf articles looks fine when zoomed in as it auto adjust the column width so that the lines auto wrap up (column width) within the screen.

What can I do with the former, to ensure i can read without sliding left /right the screen? I think this is a noobie question and sorry for posting here if it's already been discussed. Tell me so and i will search here.

Thank you for reading.

pharme
Kobo Aura