Here are some solutions. iPad works for us, we have tried different models, but you have to use the build in Safari browser. For the laptop. If you are on Windows use the build in Edge browser or Firefox.
MacOSX also works right out of the box with the build in Safari.
With the FireFox browser, this works on MacOSX, Windows, and, Linux. Rightclick the book, choose “This Frame” and then “Open Frame in New Tab” it will then open full screen.
Thanks John – I tried it and it does blow it up bigger — I didn’t have my glasses on me so I’ll try with them as it was still just a little too small for me!! Otherwise I’ll just read on my computer — thanks so much