You can change it for an already set schedule by editing the preferences, then on the next screen click Continue and you'll get the notification settings again, same as the screen above.
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Those are set. Still being notified every day at 2111. How do I stop this?
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Well the obvious quick way is to turn off the scheduled cleaning and do it manually at a time that suits.
Of course that's not a fix.
Nobody else has mentioned this (yet) so I'll do some testing here with the scheduler.
It's working fine for me here, the notifications are obeying the settings like they should.
When they are turned off then at the scheduled time a flashing CCleaner icon appears breifly in the system tray (as it should do) but that's all.
So let's see if we can work out why it's acting differently for you and put it right.
Did you have that schedule set in the previous CCleaner versions?
I'm thinking that if that was the case then something may have got a bit scrambled when the scheduler was updated as part of the 6.03 update?
I'd try reinstalling CCleaner 6.03 over the top of your existing one.
You can get the installer here: <a href="https://www.ccleaner.com/ccleaner/builds" ipsnoembed="true" rel="external">https://www.ccleaner.com/ccleaner/builds</a>
Once downloaded just double click it to reinstall CCleaner.
If it's still not behaving after doing that then you could try uninstalling CCleaner and reinstalling from scratch.
(You might want to also do a Restart of your machine before reinstalling).
Make a note of your licence name and key before uninstalling, you'll need it to re-regiser the new install.