I saw that if create a hxwidget project from template, it adds a haxeui-hxwidgets.properties file.
What is inside (.fit=true) ?
How can it be used ? is there more options ?

Depending on how it is used… fit=true can do several things… it can make the parent window resize itself to the best size for displaying the children within it for example that i’m aware of.

In the API list you can find a large number of things you can do. Now that i have looked back through it i’ll have to try some myself now.