Device View Size 1200 x 850 Must modify.

Hi,

My Web GUI runs on a fixed sized touch screen. It is developed in Bootstrap Studio. The only view used when designing is the largest screen 1200x850. This view is selected using the icon in the top right hand corner. Since upgrading bootstrap studio, my web gui is now re-sized and squashed. I need to make this largest view 1210 x 850. This is so we can design our gui as it appears on our screen. How do I adjust the default view sizes ? How do I prevent bootstrap studio upgrade from changing the default view sizes ? Thank you.