I use acrobat reader for samsung. My problem is the font view is not sharp enough. That reduces the readibility of the text. Although I can't increase the font size (except for zooming), at least I expect to increase thickness of the fonts so I can read it through less effort. In current case the font appearance is very thin. Particularly this problem occurs when I read academic papers which are usually have written through Latex software and have a different kind of font.
I know there is a reading mode but it is not handy if the pdf has lots of equations.
Hope you are doing well. Thank you for writing in!
The font size or thickness depends solely on the creator of the PDF and not Acrobat. The application would display the file exactly how it should look, and any changes to the document you suggest would need to be done manually.