If you’d like to see the data stored in your individual log files, you would need to download the specific log file from Cloud Storage. There is a Download button next to each object in the GCS browser. Depending on the type of file downloaded (such as text files), these can open right in your browser in a new tab.
In case you want to force this behavior, it can be done by editing the Object metadata to set a specific content-disposition header. Using the value of ‘inline’ would force the browser to process the file (showing it in a new tab, for example).