How to change the default link preview state

• Go in your bot:
☞ Post Editor > Add Post.
• Click the inline button «Link Preview» to toggle its state.

When adding a new message, the Bot remembers the last selected state of the button - this state will be taken when adding the next message.

This setting works in 3 modes:
Modes:
As Admin ⏯- Preview links "as Admin" (see next)
Off ⏹️- preview is disabled.
On ▶️ - preview is enabled.
The current state of the option is written on the button.

Read more in how to manage links preview.