How can TB filling trash I stop this

I just reinstalled TB after upgrading my desktop to Windows 7 64 bit (from 32 bit)
I find now that I get lots (and lots) of TB files in my trash, sometimes several gigs worth.
I remember what is happening that very long ago and there is an option to check who has deleted the files directly, rather than send them to the trash.
I have searched all the menus (I hope) but couldn't find something that says this. As far as I know, this isn't Junk Files. I deleted but that didn't make a difference.
What did I miss?

Have solved the problem.

Tags: Thunderbird

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