If anyone is used to reading text based on a specific format, changing that format would affect the ability to skim the text. I am not talking about normal read

If anyone is used to reading text based on a specific format, changing that format would affect the ability to skim the text. I am not talking about normal reading, I mean when I have to search for an idea and reference something I had seen previously in text. The spacing changes the density and the expected location. Studies so far have only been able to show that readers function better when they are already used to a specific format.