The KWIC, grid and tree visualizers support right to left layouting of Arabic and Hebrew characters. As soon as such a character is recognized in a search result, the visualization is switched into right-to-left mode for these visualizers. If this behavior is not desired (e.g. a left-to-right corpus with only a few incidental uses of such characters), this behavior can be switched off for the entire ANNIS instance by setting:

disable-rtl=true

in the file annis-gui.properties in one of the front-end configuration locations.