[DaveBlake]

You have custom nodes, hence Kodi is using the node layout defined in userdata/library/music (for all skins, although I think some add nodes of their own). It sounds like you deleted or simply didn't create a copy of the node for file view. Either copy Kodi/system/library/muisc/files.xml into userdata/library/music or create a node with contents

<?xml version='1.0' encoding='UTF-8'?>
<node order="1" type="folder">
    <label>744</label>
    <icon>DefaultFolder.png</icon>
    <path>sources://music</path>
</node>