TabsUse the Tabs width spin box to specify the width of the space that  inserts when you press the Tab key. Select the Insert spaces instead of tabs option to specify that  inserts spaces instead of a tab character when you press the Tab key. Auto IndentationSelect the Enable auto indentation option to specify that the next line starts at the indentation level of the current line.  File SavingSelect the Create a backup copy of files before saving option to create a backup copy of a file each time you save the file. The backup copy of the file contains a ~ at the end of the filename.Select the Autosave files every ... minutes option to automatically save the current file at regular intervals. Use the spin box to specify how often you want to save the file.UndoSelect the Limit to ... actions option to set a limit on the number of editing actions that you can undo. Use the spin box to specify the maximum number of actions that you can undo. Select the Unlimited undo option to set no limit on the number of editing actions that you can undo.
