Version: 15.10.0.126
Advanced>configuration>Editor>Word Wrap/Tab Settings
Select "change list" to change the extension
Then Checked
1)"Wrap after column #, insert CR/LF"
2)"Automatically insert CR/LF when file is opened"
Type
Wrap Column #
3)"68"
Make sure the "edit> toggle work wrap" is selected
Optional:
You can also choose "View>set column marker" to visually create the marker