Method 1: Click the icon as shown in the picture while watching the video to close the barrage.

Method two:

1. Open Bilibili and log in to your account.

2. Find and click your avatar or username in the upper right corner of the page, then select "Settings."

3. In the settings page, find "Player Settings" or similar option. This may vary between versions of the site, but can usually be found under a tab such as "Playback," "Video," or "Player."

4. In the player settings, look for options related to barrage. There is usually an option called "Default barrage status", "Auto barrage" or similar.

5. Adjust this option to "Off", "Do not show", "Disabled" or similar. This will set the barrage to be closed by default.

6. Save or apply settings. Some platforms may save your changes automatically, while others may require you to save or apply settings manually.

The above is all about how to turn off the barrage on Bilibili. I hope it will be helpful to you!