Using a fixed font in the views of the Console is currently not possible. But this option has already been implemented and will be available in SmartInspect 2.0. Starting with SmartInspect 2.0 you can select a fixed font, its size and which areas of the Console should use this font (views, viewer, the various toolboxes etc.).
But since you mentioned a tabular layout of your data, maybe the table viewer would be an option. You could use the TableViewerContext class (TSiTableViewerContext in Delphi) of the SmartInspect libraries to format your custom data and then log this data with the LogCustomContext method. This way your data would be displayed in the table viewer instead of the views.