In my Draw (LibO 4.2.4.2), under File > Templates > Manage is one way to get at it. Another is using the shortcut CTRL + SHIFT + N. That brings up a window that includes an "Import" button:
In my Draw (LibO 4.2.4.2), under File > Templates > Manage is one way to get at it. Another is using the shortcut CTRL + SHIFT + N. That brings up a window that includes an "Import" button: