Access Salesforce mobile app from Chrome Web Browser
We can access Salesforce mobile app in there ways:
1) Download mobile app(Salesforce) from the Apple AppStore or Google Play to mobile.
2) login.salesforce.com using a mobile browser
3) using the Chrome Developer Tools
Here is the example to access from Chrome Developer Tools.
Login to your salesforce org
Click the Toggle Mobile Device Mode button to simulate your browser as a mobile device
To simulate the Salesforce mobile app in browser, Remove the part of the URL immediately after .lightning.force.com/lightning as like below screenshot: