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Using Preview for Markup PDF (Portable Document Format) is a file format intended to ensure that documents can be exchanged reliably, independent of the type of software or hardware being used to view, print, or edit them. In other words, that PDF file you’re viewing on a Mac will look the same when viewed on a PC, or for that matter, any device that supports PDFs
This option is available for text comments added by Typewriter, Callout, or Textbox tool. You should select the text first if you want to change the appearance of text added by those text comment tools
If you want to tick answers on a PDF form, the best choice is to add checkbox to PDF. You may think of copying a checkbox online and pasting it on the PDF form