That's a four-step process (unless you do it the Windows way). Right click on a PDF, select properties, click on "opens with" change button and click on the reader. Going in through settings takes more steps and involves a whole lot of scrolling to get to the .pdf file type.Whether it's taking a series of screen shots with specific step by step instructions on how to make Acrobat/Acrobat Reader the default PDF Viewer because an update reset it to Edge
Please tell me that you don't paste this into Word.
The trick would be to prevent Windows from messing with your choices.