Step 1: Open WeChat, click "Discover", and then click "Friends Circle", as shown below:
Step 2, click on the camera picture in the upper right corner to send a circle of friends. Take the circle of friends who send pure text as an example. Just press the camera in the upper right corner to send plain text, as shown below, and then click "Who can watch":
Step 3: After clicking who can see it, the page as shown below will appear, and select "Private (only visible to yourself)", so that this WeChat circle of friends can only see it by itself.