How does LinkedIn targeting work?

In Studio Targeting you choose sender accounts, schedules/send windows, and exclude options (for example skip already enrolled or messaged contacts). Sales Launch can generate a targeting portfolio from your company profile; you can also enroll from prospect lists and manual tags. A contact on any one of those lists or tags can be enrolled.

To stop one person who is already enrolled or waiting for a send slot, remove them from every prospect list and manual tag that flow uses. The next send is blocked, including a later step and a first action that is only waiting for a slot. They stay on Planned actions until that time, and then the send does not go out. Set as inactive clears the whole flow’s schedule now and is reversible. See How do I stop a contact that is already enrolled or waiting to send?