How to start Jupyter Lab directly after customizing it and make the customized code effective, instead of starting it in development mode (code compilation) with the startup parameter - dev mode - watch

After customizing Jupyter Lab, how to start it directly with Jupyter Lab and make the customized code take effect, instead of starting it in development mode (code compilation) with the startup parameter - dev mode - watch? The JupyterLab source code we changed now includes our customized content. Currently, we can only use the command Jupyter Lab - dev mode - watch - allow root - ip=0.0.0.0 to start and see the customized effect. If we use Jupyter Lab - allow root - ip=0.0.0.0 to start, we can only see that the original Jupyter Lab does not contain our customized development content. Do any friends know how to achieve such an effect? Thank you very much!