CBA stands for Campaign Budget Automation. If your account is an Explore AI vs. No AI, CBA will work differently, according to your type of campaign.
For Google Campaigns:
CBA works with all Google campaigns. In this case, Adext AI will create a copy of your campaign with the Ad Groups chosen and which are running traditionally. It will also create another campaign per Ad Group selected, with the clones running with Adext AI, so Explore AI vs. No AI is working in equal circumstances.
For Facebook Campaigns:
CBA works only with Facebook Lifetime Budgets campaigns so we can apply Explore AI vs. No AI in equal circumstances, if its not configured on Lifetime Budgets, CBA can't be used.
For Facebook Lifetime Budget campaigns, Adext AI will create 2 campaign copies: one with the Ad Set selected running with Facebook Lifetime, and, another campaign with the Ad Set selected clones running with Adext AI, so Explore AI vs. No AI is working in equal circumstances.
CBA works only if your Smart Campaign has more than two Ad Groups/Set selected. Also, CBA will be turned ON by default in all Adext AI Uplifted accounts to improve your results.
To find out more about CBA, please read What is CBA (Campaign Budget Automation) ?