beginner's problem in displaying large data

I got a sample data (let's call it sample.data), which is about 2200 by 15.

I tried to take a look of all data

sample.data

It shows only a part of data that I thought was a corner. It does not
really affect my job, but I thought it is nice to have a look of all
data. I can see individual records and they are fine.

Is this normal because of buffer size or some reasons? Can I use other
commands or change some settings to display all data?

Thanks,
Terry