A couple of years ago a problem that was reported in the Wahoo Forum about images from the SYSTM app being too large to fit into a window. Unfortunately, the thread did not report a solution.
I have essentially the same problem and have sent the information below to the minions. I decided to post here as well, in case others continue to have the same problem or have perhaps found a durable solution.
I connect my Windows laptop to an external Sony Bravia LCD TV via HDMI to create a more immersive experience during workouts. However, the image is often larger than the app window, so that I cannot see information that is at the bottom of the image or at the far right. In particular, the power profile is below the screen so that I cannot see my progress through the workout or an interval. Similarly, the information at the bottom right of the screen that typically shows how much time remains in the workout or an interval is not visible.
When I connect the external TV, Windows automatically adjusts the screen resolution to the highest value that the TV can support, 1360 x 760. If I start the SYSTM app after I have connected the TV, the entire image is visible as long as I am in the normal mode that shows the Windows task bar across the bottom. If I try to go to full-screen mode, the image becomes too large and remains too large even if I revert to normal mode. As well, if the SYSTM app is open before I connect the external TV, the image is too large.
So a work around is to only open the SYSTM app after the TV is connected and to avoid changing the window size. But it would be great if the app could be tweaked to better understand the resolution of the monitor.