This is the word wrap option
You can set and clear the Word wrap option. When this option is set,
the portion of a long line that extends beyond the current width of
the Code Editor window is displayed on the next line. When this option
is cleared, for example, to facilitate the use of line numbering, you
can scroll to the right to see the ends of long lines.
You can disable it by
Tools menu ?? Options.
All Languages ?? General options
Under Settings, select or clear the Word wrap option.
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