dashboard - set display number of blocks

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hello, I have a web site made with concrete5. I forgot how to set the number of block to be displayed on the home page.
For example, I created 3 pages with a composer. Only 2 are displayed.
You can see it on :www.www.limmshp.iis.u-tokyo.ac.jp...
On the "Open Position", there are only 2 announces, but in fact there are 3. I cannot display the 3rd one.
I know there is a setting in dashboard somewhere, but I totally forgot how to find it, because I am not an expert in web site.
If someone could refresh my mind, that will be more than helpful,
Sincerely yours