Hi Larry...Are you kidding about enlarging the size of your Ameritrade Portfolio??? Like it will make the money grow bigger???...LOL
On a lot of pages the CTRL + Mousewheel movement won't even work at all...It's really hit and miss...
If it works on one webpage, and then you switch pages and the font is too big or small...Just do it again until you get the desired font size...It will usually hold the same font size as you surf the web and change pages, but not always...
Sometimes I boot my computer and my font size is messed up, and after the first time I adjust it, it usually holds throughout the day...