Different CSSs might offer different value-adds. We understand that you might want to control the appearance of your ads. For any questions, we recommend you contact the appropriate CSS. Each CSS is listed in your Merchant Center dashboard. All CSSs have the ability to adjust traffic volume using budgets, bids, and pausing or activating campaigns. Some CSSs provide an interface that allows merchants to manage campaigns. To opt out or in for a specific CSS channel, you can use Merchant Center’s dashboard. Opt-outs can take up to 24 hours for to take effect.