Talk about how to delete it all at once in QQ space.

You have to go to space first, and then there is a "talk" on the left. After clicking, you will see how many meetings (such as 56 meetings) are in your avatar at the top right. Click on the number "56", and all your speeches will be displayed, with deleted contents at the bottom of each speech. Can be deleted. Is it detailed enough? If you can't find it, you can find me.