We created custom folders on our home screen using the sample "SampleExtensionOpenFolderShowHideParent_11_2" as a template. In the json there is a "toolbar" property as follows:
"toolbar": [
"filter",
"sort",
"refresh",
"settings"
],
But there is no setting that I can find to provide a 'new folder' option in addition to 'filter', 'sort', 'refresh' and 'settings', on the toolbar.
Has anyone successfully created custom folders with a 'new folder' option?