When using your phone, the program should detect that you are on a smaller device and automatically offer you the following options:

•  Full screen mode 
• Large print tiles      

We definitely recommend accepting both of these options. 

Also, make sure that "orientation lock" is off and rotate your phone into landscape orientation. 

The above should ensure that the game takes up the entirety of the phone's screen. Unfortunately, the game appears smaller on some iPhones as toolbars are automatically added to the top and/or bottom of the page (even in full-screen mode). This reduce the space available for the game to display. We don't have direct control over these bars from our end. However, you should be able to hide them. Here are a couple of videos that explain how to hide the toolbars.      

• https://www.youtube.com/watch?v=Nic70o6_7DA  
• https://www.youtube.com/shorts/MNb5Ruw6KHk?feature=share    

Note that Apple keeps changing the way things look. So, what is shown in the videos may be slightly different from your phone, but it should be similar.