In article , Pat Wilson
wrote:

it's not a native ipad app. it runs in compatibility mode.

What does that mean, to a very basic user such as I am?

a native ipad app is designed for the larger display on an ipad and
will not run on an iphone at all.

an iphone app can run on the ipad in compatibility mode which is either
original size (i.e., small) the middle of the display or pixel-doubled
to fill most of the display by tapping the 2x button in the corner.

neither is ideal, but it may be acceptable, depending on the app.