ItemSize is for the 3 other views only, not for the Details view.
For the Details view, the height of the rows is a theme property.
You can change it e.g. with the following mixin theme.
Simply put it into your Themes folder as Application.mixin.theme
(just tested with your sample for the Selected property):
I already saw the property listView1.ItemSize, but in view=Details, that I need, this property has no effect.
Hi, if listView1.view=Tile you can set the height with listView1.ItemSize property
In other view modes i don’t know.