Once the evolution is finished, if the option "Start again when finished (continuous repeating evolution)" is enabled, SQX again will randomly choose others "x" different number of blocks and so on.
Actually the option "Randomly choose 100 blocks" is present in "Building blocks" section but it is fixed for every new initial generation, my proposal will allow instead to further diversify the strategies produced with genetic evolution because every initial generation different "x" blocks will be used.