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In HFSS, select the surface for which you want to plot the E field, go to "Field Overalys" option which is below the Results, right click and you can figure out the remaining on how to plot.
You can either select the last adaptive frequency or the frequency sweep.
There are different options, like Magnitude of E field or Vector E field.
There is no direct option to plot Ex or Ey in HFSS. Instead you need to use the "Fields Calculator" in HFSS under "Fields Overlays" option.
And add an expression which can calculate the Ex. As you know you can calculate the Ex using the dot product of E with x(hat) ie., (xΛ).
Ex = (Ex.x[hat] +Ey.y[hat]+Ez.z[hat) . (x[hat)
If you are using Fields Calculator for the first time, then you need to spend some time in understanding how it works. See the below link, it has two downloads :1) Fields Calculator Cookbook in HFSS
2) Field Vector Calculations.