How to delete the conversation in WeChat so that others can't see it?

If you don't want others to see it, you can click on the other person's avatar to enter the home page, click on the menu in the upper right corner, and select Set Friends Circle Permission to prevent the other person from seeing your friends circle update.

If you want to delete a circle of friends at one time, you can click Me-Settings-General-Functions-Friends Circle, and then go in and turn off this function.