Here you can set the font size and foreground and background color of the floating glucose. You can also set background to Transparent, making it invisible.
Touchable: when set you can move the floating glucose with your finger and remove it by long pressing it (without moving). When touchable is unset, touch input goes to the window beneath the floating glucose, so you can use the app under the floating glucose. You can also make the floating glucose untouchable by double tapping it.
After typing the font size, you have to press the “Enter”, “Done” or "✓" -button on the soft keyboard.
You can turn on and off Floating glucose with left middle menu->Float. You can also turn off “Floating glucose” by long pressing on the floating glucose value. For example when you have set the font size so large that you are not able anymore to type a smaller font size on the soft keyboard.
To display over other apps Juggluco needs a special permission. On WearOS and also Android Automotive you need to use adb to give this permission:
adb shell pm grant tk.glucodata android.permission.SYSTEM_ALERT_WINDOW
On some watches (for example TicWatch Pro), you can also allow it with: Android/WearOS settings->Apps & notifications-> App info->Juggluco->Advanced->Display over other apps.