Thanks for helpingMauser wrote: Wed Feb 19, 2020 4:14 pm Right click the panel > Properties> select Appearance> unselect "Adjust size automatically" then adjust "Fixed icon size."
I could not find the option you referred to ( maybe its later version of xfce? I am on mx18 ) but you set me looking in the right area ( windows buttons )and when I turned off "show labels" the icons resized - see below
further below that are the options for the panel appearance that I have

