I already found it in the alfresco book.
@ etzapata:
The book Alfresco by Munwar Shariff explains in chapter 11 how to change your default settings on "details view", "Icon view" and "browse view". The book also explains how to see more documents on a page.
In the extensions folder (<alfresco_install_folder>\tomcat\shared\classes\alfresco\extension) you have to add the following XML block in the web-client-config-custom.xml file.
<config evaluator="string-compare" condition="Views">
<!– the views available in the client –>
<views>
<!– default values for the views available in the client –>
<view-defaults>
<browse>
<!– allowable values: list|details|icons –>
<view>details</view>
<page-size>
<list>9</list>
<details>15</details>
<icons>9</icons>
</page-size>
</browse>
</view-defaults>
</views>
</config>