Here you can set how most of the events will look on screen.
Remove surrounding whitespace When checked whitespace around events will be removed befor showing them on screen.
Cache events on pause This will save events in memory and shown when you unpause the viewer.
Show listener header Some listeners add column headers to the events if you check this one.
Save to file If you check this ALL received events will be saved to a file before they are filtered or shown on screen. Rolling decides when the log file is closed and a new one created. This is to stop the file from becoming to big.
Max number of characters in the viewer When there are these many characters in the viewer 10% will be removed from the top. If you don’t need a lot of history you can set this to a low number to save some memory.