Update 2018
Starting with Adaxes 2018.1 there is a filter option in Adaxes Web interface. The option is present on all the pages and can be used to filter out the information displayed including approval requests.
Original
Hello,
Currently, this is not possible. However, for the next release, we are going to totally redesign the look and feel of Adaxes Web Interface. Among the new features, there will be the possibility to filter Approval Requests.