I can't find information on how to enlarge the legend

Questions
1

Plot[{2/3, x, x^2, x^3}, {x, 0, 1},
PlotStyle → {{Dashed, Black}, {Thick, Orange}, {Thick, Red}, {Thick,
Blue}}, AspectRatio → 1/1, PlotRange → {{0, 1}, {1/3, 1}},
FrameStyle → Directive[Black, 16],
PlotLegends →
Placed[LineLegend[{None, “No Protocol”, “Repetition Protocol”,
“Feedback Protocol”},
LegendFunction → (Framed[#, FrameMargins → 0,
Background → White] &)], {Center, Top}], Frame → True,
FrameLabel → {{Style[#, Black, Bold, 16] &@(“F”),
None}, {Style[#, Black, Bold,
16] &@(“!\*SubscriptBox[\(p, 1])”), None}} ]

2

One way is to enlarge the font size:

LineLegend[{None, Style["No Protocol", 15], 
  Style["Repetition Protocol", 15], Style["Feedback Protocol", 15]}, 
 LegendFunction -> (Framed[#, FrameMargins -> 0, 
     Background -> White] &)]