On the top right section,

1 – Click on the Search Icon to search for specific names

2 – Click on the Cog Icon to view in Thumbnail

3 – Click on Refresh Icon to refresh view

To Download a presentation, Click on the arrow above to view options

To Preview a Powerpoint Presentation, click on any file, or click on a folder to view more files.

Do not Download in the Preview mode, this will only Download PDF version. Go back to the Thumbnails and click download on the dropdown.