@DesignDude there isn't a way around that. The text is sized by font size while the rest is by paper space. I would suggest editing the scrapbook and resize the symbols you need to suit the typical scale of your work. Save the changes and then you won't have to do it every time you need to use them. Take advantage of the editing time to remove symbols you'd never use and maybe rearrange them to make them easier for you to access.
Save your file in legacy SketchUp formats. Please note that if you save in older versions of SketchUp, the organization of tags into folders and other features implemented in later versions will be lost.
This is a known issue and the developers are aware of it and working on a solution. Hopefully they'll get it fixed in time for the first maintenance release.