"Exclude people added to other campaigns" - is a filter that can be applied at the last step of creating a campaign to show and remove contacts from previous campaigns,
The filter is turned on by default. The "Available" tab shows the total number of contacts in your campaign (with and without exclusions).
The "Already in connections" tab shows the people who you are already among your 1st-degree connections. Connection requests will not be sent to them.
By hovering the cursor over the symbol next in the campaigns column (see the screenshot below) you can see in which campaigns the contact has been used before and the status of those campaigns.
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