Hello,
Currently, you cannot make alphabetical search the default search page in Adaxes.
The only thing you can do is to publish the link to the search directory by adding SearchAlphabetical.aspx at the end. In this case, when users sign in to the web interface, they will be redirected directly to the alphabetical search.
So, for example, if you installed Adaxes Web Interface on computer named computer.domain.com, and you chose to use the Self-Service Web interface to use as the search directory, the URL will be:
http://computer.domain.com/AdaxesSelfService/SearchAlphabetical.aspx