Looks like NavigationView is taking up too much space if flex is set to "WH"

import ui

view = ui.View()

table = ui.TableView()
table.flex = "WH"
table.data_source = ui.ListDataSource(["tableview.py", "items"])

nav = ui.NavigationView(table)
nav.flex = "WH"

view.add_subview(nav)
view.present("sheet")