The various settings for the Visual Studio editors can be controlled from the Tools/Options menu.
The values for the settings are stored in the file XSharp\EditorSettings.json in your roaming profile folder.
If you have multiple Visual Studio installations, the settings will be shared across all of them.
When you open this menu, you will see a window like this:
Tools Options dialog
On the left-hand side, there is a tree-view in which you can select the category of the options you are interested in.
This dialog contains a large number of options.
To make navigation easier, you can use the edit control on top to filter.
All X# options can be found by typing "X#" in this control. This will display the categories related to X#.
Tools Options filtered on X#
The Text Editor category (which was also visible on the first image) contains settings for all languages supported by Visual Studio or by extensions installed inside Visual Studio (such as the X# Visual Studio extension).
Under the Debugging category, there is an entry for settings used by the X# expression evaluator in the debugger.
The last category includes settings for the VO-compatible form editor and some of the other X#-specific editors.