For a Single Browser:

1. On the [Browsers] page, create a new browser or edit an existing one to access the browser configuration page.

2. Scroll down to the "Fingerprint Settings" section and find "Launch Parameters".

3. Enter --headless in the input box and click "Confirm" to save.

Batch Setting for Browsers:

1. On the [Browsers] page, select all or check the browsers that need to be set to headless mode.

2. Click on "More" in the upper right corner and select "Batch Edit Browsers."

3. Choose "Edit All Browser of Selected".

4. Scroll down to the "Fingerprint Settings" section and find "Launch Parameters."

5. Enter --headless in the input box and click "Confirm" to save.