PyQGIS Close Layout Window

Question

I have a script that iterates through layer subgroups in QGIS 3.6, opens a layout with the with the same name as the subgroup and exports a PDF. What I am struggling with is to close the active layout window after the export. Any ideas or other ways of doing such task?

from qgis.core import QgsLayerTreeGroup, QgsLayerTreeLayer
import os,sys

root = QgsProject.instance().layerTreeRoot()
project = QgsProject.instance()
projectLayoutManager = project.layoutManager()
for child in root.children():
    if isinstance(child, QgsLayerTreeGroup):
        #print ("- group: " + child.name())
        for subChild in child.children():
            if isinstance (subChild, QgsLayerTreeGroup):
                print ("- group: " + child.name() + "-subgroup: " + subChild.name())
                #turn on subgroup
                child.setItemVisibilityChecked(True)
                subChild.setItemVisibilityChecked(True)
                #open layout
                l_out = QgsProject.instance().layoutManager().layoutByName(subChild.name())
                iface.openLayoutDesigner(layout=l_out)
                mapName= (subChild.name()+".pdf")
                print (mapName)
                base_path = (r"F:\Documents\PDF")
                print (base_path)
                pdf_path = os.path.join(base_path,mapName)
                print (pdf_path)
                #export layout
                exporter = QgsLayoutExporter(l_out)
                exporter.exportToPdf(pdf_path, QgsLayoutExporter.PdfExportSettings())
                #close Layout
                ???

                #turn off layer
                subChild.setItemVisibilityChecked(False)

Answer 1

If you have only one layout open:

designer = iface.openLayoutDesigners()[0]
designer.close()

To close a specific layout using its name:

designers = [d for d in iface.openLayoutDesigners() if d.layout().name() == 'Test_Layout']
if designers:
    designers[0].close()

Or close all open layouts:

for d in iface.openLayoutDesigners():
    d.close()

Answer 2

You can use the QgsLayoutManager.removeLayout() method to remove layouts:

projectLayoutManager.removeLayout(l_out )