Before calling fmincon() you need to set various options which control how the function is applied.
In your case you will want to set 'Display' to 'off' like:
options = optimoptions('Display', 'off');
So in your case something like this should work:
[x,fval]=fmincon(@HenriMLF.mlfEvalAtPoint,x0,A,b,Aeq,beq,lb,ub,options);
More documentation is here.