[SDPhantom]

The PvP and Prestige icons are two different things, though the later replaces the former when applicable. Here's code for two different options.



Restore PVP Icon:

local OpposingFactions={Horde="Alliance",Alliance="Horde"};
local function UpdatePVPIcon(icon,unit,showmercenary)
    local faction=UnitFactionGroup(unit);
    local opposite=faction and OpposingFactions[faction];
 
    if UnitIsPVPFreeForAll(unit) then
        icon:SetAtlas("UI-HUD-UnitFrame-Player-PVP-FFAIcon",TextureKitConstants.UseAtlasSize);
        icon:Show();
    elseif UnitIsPVP(unit) and opposite then
        icon:SetAtlas(("UI-HUD-UnitFrame-Player-PVP-%sIcon"):format((showmercenary and UnitIsMercenary(unit)) and opposite or faction),TextureKitConstants.UseAtlasSize);
        icon:Show();
    else icon:Hide(); end
end
 
hooksecurefunc("PlayerFrame_UpdatePvPStatus",function()
    local parent=PlayerFrame.PlayerFrameContent.PlayerFrameContentContextual;
 
    UpdatePVPIcon(parent.PVPIcon,"player",true);
    parent.PrestigePortrait:Hide();
    parent.PrestigeBadge:Hide();
end);
 
local function TargetFrame_CheckFaction(self)
    local parent=self.TargetFrameContent.TargetFrameContentContextual;
 
    UpdatePVPIcon(parent.PvpIcon,self.unit,false);
    parent.PrestigePortrait:Hide();
    parent.PrestigeBadge:Hide();
end
 
hooksecurefunc(TargetFrame,"CheckFaction",TargetFrame_CheckFaction);
hooksecurefunc(FocusFrame,"CheckFaction",TargetFrame_CheckFaction);

Disable both:

hooksecurefunc("PlayerFrame_UpdatePvPStatus",function()
    local parent=PlayerFrame.PlayerFrameContent.PlayerFrameContentContextual;
    parent.PrestigePortrait:Hide();
    parent.PrestigeBadge:Hide();
    parent.PVPIcon:Hide();
    PlayerPVPTimerText:Hide();
    PlayerPVPTimerText.timeLeft=nil;
end);
 
local function TargetFrame_CheckFaction(self)
    local parent=self.TargetFrameContent.TargetFrameContentContextual;
    parent.PrestigePortrait:Hide();
    parent.PrestigeBadge:Hide();
    parent.PvpIcon:Hide();
end
 
hooksecurefunc(TargetFrame,"CheckFaction",TargetFrame_CheckFaction);
hooksecurefunc(FocusFrame,"CheckFaction",TargetFrame_CheckFaction);