How to configure size of widget, or size of lines, or font, or anything?

[varung]

[gereleth]

You can use layout keyword to control overall size of the widget like this:

widget = BBoxWidget(
    image='fruit/fruit.jpg',
    classes=['apple', 'orange', 'pear'],
    layout={'width': '300px'},
)

As for font size and the rest - I don't think there's an easy way to do this currently.