In the main window, select View | Configuration or click the Configuration button: 
on the toolbar and select the Fonts tab.
Select the name of the font in the list.
Select the font style to be used in the Derivative Frame, Global Comparison and Ancestor windows in the Serena Merge Tool.
NOTE If you are comparing files using a double-byte character set, you will need to select "The system font" in this list.
To select the font:
In the main window, select View | Configuration or click the Configuration button: on the toolbar and select the Fonts tab.
Select the name of the font in the list.
Related Topics
Setting the Merge Tool Options