Use for imports (as required)

import QtQuick 2.0
QtQuick.Layouts 1.1
import "."
import "platform"

When defining width of the columns on the page, don't use anchors, but

width: page.width

Otherwise, Kirigami platform may get to trouble.

Pages (PagePL) can have only one item. If some Connections, Timers, or similar is added, define them under the main item. This seems to be limitation of Kirigami ScrollablePage.