Will all six spark plugs be accessible if you remove the Ford cover plate at top of engine intake manifold on a Escape XLT?

No, removing the Ford Escape XLT's upper intake manifold cover will not give you access to all six spark plugs. While it will improve access to *some* of them, others will likely still be obstructed by other engine components. You'll likely need to remove additional components (such as parts of the intake manifold itself or possibly even other accessories) to reach all six spark plugs.