Hi DeboGeo,
As you are using "Save as" option in Word, there is nothing much that can be done from our end as it is not using Acrobat PDF maker to convert file.
Adobe Acrobat Reader DC is a free service and you cannot create PDF using this application.
However you can try changing resolution to view PDF. Open Adobe Acrobat Reader application and go to Edit menu > Preferences > Page display. Select custom resolution and select the required resolution.
You can also change size while printing PDF in Print dialogue box.
Click on Print icon in Reader application, go to Properties > Advanced > Adobe PDF settings.
Regards,
Meenakshi