When the phone is unfolded, the screen size is not adjusted.
pixel_player52827288 IDK about the folding devices, but wondering if something needs to be changes under the device settings? I found this regarding adjusting apps for full screen on other Samsung devices: https://www.samsung.com/us/support/troubleshooting/TSG01001466/
If nothing else, you might wish to contact Pixel Support: https://portal.pixelfederation.com/en/diggysadventure/support Once on the link, scroll PAST the white search 🔎 box & choose a category to begin a help ticket. Support can also be reached by enail: support@diggysadventure.com