If you want to see the keywords of a file, press the I button. This will open a dialogue showing you all IPTC/XMP fields, including the keywords.
If you want to always be able to see them, for every file, you could add {keywords} to the Info Text (under settings in the edit menu) and enable "Show Info Tooltips" in the view menu; then you'll see the keywords when your mouse is hovering over an image.
Another solution would be to specify {keywords} as one of the Labels on the "Contact" sheet preferences pane.
Hope this helps,
Hayo