Hi,
This is not possible in v6 yet. Be patient, Acyba will bring it back.
Fortunately there is a workaround:
In your statistics there's an export button that will export all statistics to an Excel file. Once exported open a blank sheet in Excel. Go to the tab data and select "From text/.csv". Excel will properly import your data and applies filter options to the first row, so you easily can filter and select whatever you want.
In case you need to send mails based op clicks or opens, you can use mass actions or automations and apply the statistics filter.