How do you make lines at word / open office?

On my laptop it looks different than on a computer I do not know how to make the lines in an application knows who?

Any line you insert with: Insert-Shapes-Line

A line in the current line with: --- and Return (three times minus sign).

PS: applies to Word

PSPS: also applies to Open Office

The minus key -----------------------------------------------

Then an enter, you have a thick continuous line