I login on salesforce simulator but it gives me a classic view and I want to get a mobile view. how can i get.
For reference, I have attached the screenshot
Salesforce retired the mobile web experience with the Summer '20 release. You can read the Knowledge Article here.
As per now I do not think that you are able to test your developments emulating the mobile app on Chrome/SF1 Simulator, even though they said that simulator builds of the Salesforce mobile app would be available to download.