I'm not sure if this is the right place to post a bug report but here it goes.
When I switch my phone to "Do not disturb" mode, the window that pops up letting you chose when to end "Do not disturb" does not fit the screen.
I don't have this issue. Its showing properly. My Display Size is Small and Font Size is Large.
I'm on a 7 plus model number 1046-TA running the stable Android 9 version which I sideloaded through ADB.