To set the default interpreter to "none" in all your MATLAB figures, use the following command
>> set(0,'DefaultTexInterpreter','none');
Source: https://in.mathworks.com/matlabcentral/newsreader/view_thread/285567
>> set(0,'DefaultTexInterpreter','none');
Source: https://in.mathworks.com/matlabcentral/newsreader/view_thread/285567