Do you want to pass data from your PowerApps app to your Microsoft Flow?
Further, do you want to remove the extra parameters in Run() function within your PowerApps app?
The required parameters of the Run() function is based on the parameters that you specified within your Microsoft Flow. In other words, if you specified three parameters that you want to pass from your PowerApps app within your Microsoft Flow, the Run() function would be required to provide three parameters within your PowerApps app.
If you want to remove the extra parameters in Run() function within your PowerApps app, I afraid that there is no way to achieve your needs in PowerApps currently.
In addition, you could consider remove extra parameters within your Microsoft Flow and save your flow. Then take a try to execute the Run() function again within your PowerApps app to check if the extra parameters are moved from your Run() function.
More details about starting a flow from an app, please check the following article: