Hello @wonderFine,
TouchGFX simulator is based on the display size that is set in your project. You can validate the set dimensions by navigating through
generated\gui_generated\include\gui_generated\common
and checking the SIM_WIDTH and SIM_HEIGHT that are defined in SimConstants.hpp
In addition, you can follow the execution of the simulator if you open the Application.sln file that is generated inside:
simulator\msvs
So, there is no scaling factor or function, and the simulator window should be as large as the your defined display.
Please, send a screenshot of the problem and explain more about your procedure of creating your project. Are you using the available board setups in the TouchGFX Designer? Are you developing on a custom board?