Hi @Yirmeyahu_Pakpahan , currently TensorFlow Lite Model Maker doesn’t provide such customization. 
We are only targeting at easy-to-use interface for creating a model, instead of swapping every bit of modules. Usually, changing learning_rate and epochs will be the option to tune model quality.
(BTW, if you are interested in adding this feature, you can contribute code to Model Maker’s repo, and  make it work in nightly version.)