How to make wider empty bar ?

Hello,

I am new on this forum and new musescore user. And I have never used other software to make sheets.

I would like to know how to do the following thing :

In a sheet (a file), I have one line with notes. I chose 8/4 bars.

I would like the following line(s) to be empty (only the five lines), so that another person can exercise music writing.

But now :

1. The bars are narrow (because each one has only one breve rest). I would like the bar to be as large as the line.
2. The breve rest appears. I want it to disappear (when I print).

In summary, in a same file : some lines with notes and some lines with only the five lines and the G-clef.

[Excuse me if you see some errors. My mother language is French.]