How frustrating!
Thanks for the heads up @Bluetit1802 will give it a good look before waving it in the direction of the sensor!
Be warned, when I have all the kit, I may come callingYou need to download the Libreview app before you do anything, and change all the settings on that. You need something to connect the reader to your computer device. That's the only way you can change things as far as I know, and you also need to connect to the app to be able to see all the graphs at a decent size. I use my PC because of the big screen, so use a USB thingy. There are a few settings on the actual reader.
Be warned, when I have all the kit, I may come calling![]()