@Christmas052
If you have the snowflake icon in your toolbar, you can open the panel with a single click. There, you will see a green button labeled "Snow is ON", which means the snow effect is enabled for all tabs. To stop the snow, click this button, it will change to a red "Snow is OFF" button.
If you need help, please use the official support channel at https://www.stefanvd.net/support -> email support.
Thanks,