4 bars per line in every part

I'm a newbie at this, so please accept my apology if this is a dumb question.

I wrote a score for an octet. I set the conductor's score for 4 bars per line, which worked fine.

But, the individual parts did not change automatically. I had to do each one separately.

I couldn't find an Apply To All Parts buttom that would do this.

Is there a way? What might I have missed

Thanks in advance.