Can I undo the newtab shuffle?

I'm struggling with the changes to my homepage in recent releases. I use (and love) the about:newtab setup. Frankly, it's a big reason I use Firefox. I had the old 5x8 setup of thumbnails, with everything where I wanted it and could easily find. I'm 67 so this is probably much more important to me than someone younger, Changing the number of columns when you switched it to 5x10 threw off where everything was, so I had to rearrange. Okay., I did. But then you go and change it back to 5x8 and now I've lost a bunch of stuff and have to rearrange everything again. Can I get 5x10 back? If so, please let me know how. Thanks.