Look for the following code in PerfectRaid.lua
Uncomment the bar:Hide() line:
Code:
local bar = CreateFrame("StatusBar", nil, button.healthbar)
bar:SetPoint("BOTTOMLEFT", 0, 0)
bar:SetPoint("BOTTOMRIGHT", 0, 0)
bar:SetHeight(2)
bar:SetStatusBarTexture("Interface\\AddOns\\PerfectRaid\\images\\smooth")
button.manabar = bar
bar:Hide()