Sites with disabled impressions
On the campaign edit page, open advanced settings. In the “Text & Image Ads” campaign, go to the Disable impressions block and then to the Sites section. For other types of campaigns, to the Sites with disabled impressions block.
You cannot disable impressions in Yandex search-related projects.
If you add a site to the blocked list, campaign ads won't be served on either content pages of this site or search results for it. If you block impressions for an ad exchange, campaign ads won't be served on any of the sites in that ad exchange. However, if a particular site from a blocked ad exchange is included in YAN or a different ad exchange and you didn't block that site individually, then ads will continue to be served on that site.
You can't add blocked sites in the Campaign Wizard.
To see what sites your ads were served on, go to Report Wizard and use the Ad platform name cross section.
Excluding sites and ad networks may negatively affect the performance of your ad campaign and cause you to lose some of your potential audience.