For viewing resources such as e.g. images (see image below) just select the image resource you would like to have a look at in the browser panel. Then press the option view in the content panel and the image should be displayed right there. For written resources (eaf format/Elan files) you will be redirected to a new window, to the Annex viewer. Selecting view for other formats of written resources, video or audio resources makes them be played in the content panel. Note that viewing resources generally requires access rights.
On corpus or session nodes there is no view option, metadata will be displayed at selection of the nodes immediately in the content panel.