General options

Remember most ... open files
Dertermine, how many open/stored documents must the application keep in memory.
Offer list ... files
Choice to display/hide a list of last open/stored files. If number of momentally opened files will be bigger then this limit, application display a choice "More files...". This choice consequently displays a window, from which you can open a file, that is not in list.
Display most ... windows
This choice limited number of items in list of open windows. If number of subsequently opened windows will be bigger then this limit, application diplay a choice "More windows...". This choice consequently displays a window, from which you can open a application window, that is not in list.
Change width of column in a source code view
You can chhose Manual - user can manipulate column width (but not column order), or Authomatic - columns have a fixed width and column which display source code will have maximum length depending on grid width.