For the diff dialog, Cervisia uses the option -U to diff. This lets diff show only a limited number of lines around each difference region (context lines). Here you can set the argument to -U.

Here you can add additional arguments to the diff. A popular example is -b which lets diff ignore changes in the amount of whitespace.

In the diff dialog, tab characters present in your file or in the output of the diff command are expanded into a fixed number of space characters. By default, each tab is replaced by eight spaces, but here you can setup a different number.

When you use any of the features which show the diff dialog, like View → Difference to Repository..., Cervisia invokes its internal diff frontend. If you prefer a different one, like Kompare, TkDiff, or xxdiff, enter its file name and path here.