You can now play all of our PVE Campaigns entirely solo, with no AI Teammates. Simply toggle them off in the game menu for a true, lone wolf experience. Be careful however, as this mode means that each down is counted as a death since there is no one to revive you.
https://ghost-recon.ubisoft.com/wild...m:152-76770-32
You said in all of your PvE Campaigns. But I went to Fallen Ghosts DLC and the option is not present. Checked in Narco Road as well, but I would understand the unavailability of it in that campaign.
Teammate customisation in Fallen Ghosts also still not present, although Nomad character change is.