The "Open" item allows you to open an SVG document from Google Drive.
The window that appears shows the list of documents.
To show the contents of a folder double click on it.
To open a document, double click on the file.
The button bar at the top left, allows you to:
1) Show the main list (root) of the files in Google Drive.
2) Show the contents of the "Shared with me" files.
3) Go up one layer in the file structure.
4) Reload the list of current files.
The buttons at the top right allow you to list the contents of the files in List and Icon mode.