See the space of permission setting.

1. First, open QQ on your mobile phone, and click Friends Dynamic, as shown in the figure below.

2. Then in the open page, click Tell me, as shown in the figure below.

3. Then, in the page that opens, click on the three points behind the conversation that you want to cancel only visible to you.

4. Then in the page that opens, click Edit.

5, click who can see, click everyone, as shown in the figure below, the modification is complete.