Set legends linewidth for all open figures/plots at once

Hi!

Since I a bit colourblind and using a 4k screen, so I need to set bigger fonts and linewidth so I see the text and colours properly.

So far, I've been able to add a function to my matlab path which I run every time I want to change the plot/figure to my liking. However, I am missing how I can edit the legend textwidth and font size. Is there a way to set a default value or for current session without having to sending the legend to a function, or to find it using:

get(findall(gca, 'type', ""LEGEND""))

This is the code I have so far:

This is the code so far:

function f = sfd() % set figure defaults    
    set(groot,'defaultLegendLineWidth',3)
    set(groot,'defaultAxesLineWidth',1)
    set(groot,'defaultGraphplotLineWidth',1)
    set(groot, 'DefaultAxesTitleFontSizeMultiplier', 1.5) ;
    set(groot,'defaultLineLineWidth',1)

      set(findall(gcf,'type','line'),'linewidth',4);
      set(findall(gca,'type','line'),'linewidth',4);
  end

[David J. Mack]

Hey Martin, does not seem to be that easy. You have to set the LegendFontSize and the LegendFontSizeMode to achieve an actual effect. Have a look here for a similar problem: Default Text Size in Legends