You can select what types of files to show in the browser view using the View ▸ Filter dialog. The default is to show all media files (images, movies, audio), but this can be made more or less restrictive.
The figure above shows how to configure gThumb to display media files only, by setting the General Filter.
Also, by enabling Filename in Other Filters, a filter-by-filename ability is added to the filter bar at the bottom of the browser view:
In the above figure, the filename filter has been configured to show only files with "gen" in the filename. The matching is case-insensitive.
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