How can I turn off the automatic plotting when using bayesopt

Question

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I used the bayesopt to help me obtain proper hyperparameters of SVM. However, since many different SVMs are needed, the bayesopt is called in a loop, like

for i = 1 : N
    ...
    results = bayesopt(minfn,[sigma,box],'IsObjectiveDeterministic',true,...
    'AcquisitionFunctionName','expected-improvement-plus', 'Verbose',0);
    ...
end

Thus the automatic plotting by the function baysopt is undesirable. And I also think it made the run time of the code longer, did it?

I have faild to find any input argument to handle this. Here I paste the code fragment in BayesianOptimization that is related:

function this = runSerial(this)
            ...
            this = callPlotFcn(this, 'initial');
            ...
            while ~optimizationFinished(this, iteration)
                % Maybe print verbose line
                ...
                % Do a function evaluation and record results
                ...
                % Choose next point
                % Update timing, plots and output
            end
            ...
            this = callPlotFcn(this, 'done');
            ...
end