If you ever find that you need to set the tabIndex of a campaign to a specific value, or remove it entirely, you can do that via Campaign-level Metadata.
In the campaign that you want to modify, navigate to the Campaign Metadata under Campaign Settings in the upper left:
For example, if you wanted to set the tabIndex to 5, you would set the metadata to boxtabindex: 5:

If instead, you wanted to remove the tabIndex and let the browser decide, you would use boxtabindex: remove:

Want to get more from Digioh?
Get the playbooks leading brands use to convert more visitors into revenue.
Browse the Playbooks