Adjust OFDM parameters in RF SoC ofdm demo

Hi there,
I am working with the RF SoC 2×4, specifically the OFDM demo. It has been very useful—thank you for providing the source files.
As I understand it, the baseband signal, OFDM, and its parameters (such as the number of subcarriers and spacing) are defined in MATLAB Simulink. Using HDL Coder, some IPs are generated, which are then fed into VIVADO to generate the .bit and .hwh files as an overlay.
I am wondering: how can I change the OFDM parameters? Should I modify them in Simulink, generate new IPs, and then synthesize new .bit and .hwh files? Or is there a shortcut to avoid re-synthesizing?
I would appreciate your input on this.
BR,
Navid