Wrong Display Layout for an app

Have one problem with an app (xdrip+) after I install it it is somehow not displaying the app correctly on the screen. the app is pushed up and there is a blank space on the botton abou 1/3 of the screen. Is there any way to correct this and display the app on whole

Select the square mode…

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it doesnt changed much. it is still pushed up and extremly small.
was the first thing I made

That’s pretty much all we can do.
That should make all edges visible for you.
Do you have a picture of this too ?