Thanks for your answers and explanations on CCleaner.ini.
I didn't uninstall my CCleaner before installing the new version. It was offered in a pop-up when I launched my CCleaner.
In my personal browsers settings, the only box ticked is Cache. After installing, I usually check that these preferences are not changed and they are not changed. So I did not do it this time. Unfortunately ...
If you're sure that preferences can only be reset after uninstalling, the only explanation I see is that the previous version was installed after uninstalling and never used (otherwise, I would have already encountered the problem).
Regards