Latest version Clear Private Data doesn't retain settings
Your latest version (1.5.658.44) just released, doesn't retain settings for clear private data, and requires re-selecting each time used.
Known issue. Use the Clear Browsing history on the History Tab for now. That does remember your preferences. Set a Shortcut such as Ctrl H to open the history tab instead of going via speed dial.
Just pulling a ticket on this issue because it's aggravating. Pesala's trick works.
@cpvivaldi Yes, it works because it is the old Clear dialog.
The new one need some more work and it will come fixed remebering the last selections. But i have no timeline.