Does anyone know if Notepad++ can display a vertical line on the right margin to indicated that the text will or will not fit on a printed page? I have looked but I cannot find it. Word wrap does work, but it wraps by my screen width, not by the width of a printed page.
As you said you do not actually want to print it, you may use the Vertical Edge Settings.
Setting > Preferences > Editing > Vertical Edge Settings > Input column position(s) seperated with space, for example
Vertical lines would then be shown at the positions specified (e.g. column 80 & column 100).
You can tick Background mode if you prefer highlighted text instead of a line.
(Tested in: Notepad++ v7.8.9)
In case you are looking for this option in Notepad++ at ~v7.8, the setting is located near the center of the "Vertical Edge Settings" window under
Settings > Preferences > Editing:
You can type in one or more numbers (separated by white space) to show one or multiple vertical lines.
In the example below, I have a "warning" line at line 70, and a hard limit at 80. Hope this helps.
I think modern Printers are able to auto adjust words so that can fit in the sheet. So don't worry about margins.
I suggest you use to Microsoft Word for typing documents that you want to print.
EDIT: I couldn't find anything that could provide a vertical margin in Notepad++. But as Workaround for text readability, once the text is written select all the text then press Ctrl + I (shortcut for Split Lines). One Disadvantage is that you have to keep your window size steady i.e don't resize it.