When you are adding interests using your Facebook Ads Manager, Facebook will give you an indication / estimate of the total reach your ad will have.
Unfortunately, Facebook does not provide that data in their API, which simply means we don't have access to that information.
In other words, you cannot see the total reach / audience of the ad sets you are adding inside of ConnectExplore. You will have to add the interests to your Facebook Ads account first. Then, log into the Facebook Ads Manager to check the estimated reach there.
How to get your support tickets resolved faster
Statistics have shown us that the more you tell us when you report an issue, the faster we solve that ticket. So...
1 - If you have screengrabs, please include them. A picture is worth a thousand words.
2 - If you have recorded a video showing the issue you're having, please include that as well. A video is worth a million words.
We recommend a free service called Loom for creating these videos. (this is a link to https://www.useloom.com/)
3 - To speed up ticket resolution, follow these useful tips How to Write the Perfect Support Ticket (That Gets Results Fast)