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Internal Editor Page (Preferences Dialog)
The Internal Editor page on the Preferences dialog allows you to configure options for internal editor.
In the latest stable release, these options are on Editor page.
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Refer to documentation of page sections:
Display
The Wrap long lines checkbox makes long lines be wrapped in an internal editor. When unchecked, the horizontal scrollbars appear instead to allow you to see long lines.
Use Tabulator size to specify length of tabulator in characters.
Use Default encoding to select default encoding for edited files. If the file includes UTF-8 BOM, UTF-8 encoding is used, disregarding the preference. You can also change encoding for particular file on internal editor window.
Font
Use Select Font button to select font for an internal editor. The preview on the right will show you what the font looks like.
Further Reading
Read more about Preferences dialog and its other pages.