Never used the nvidia app but you can completely remove the driver altogether along with the app using DDU and reinstalling the previous driver manually, given you have the previous driver package downloaded
You can just clean install (make sure to click on custom while installing) or use the DDU application to completely remove the current driver and then install it from the package that you downloaded
Also, when you are done installing the driver, make sure to check for updates on windows that downloads ur monitor drivers. Change your refresh rate to highest as well