PC

you can switch using the cog wheel (settings) lower right corner

Your preference for mobile mode is now stored as a cookie within your web browser. To revert please follow the following steps:

1) Close any tabs for Call of War.

2) In your browser settings, clear cache and delete cookies relating to CallofWar.com

3) Close and restart your browser.

4) Visit Callofwar.com and log in again using the arrow in the upper right corner. You will find that desktop mode is the default setting.

Please note that you will have to log in again to any websites that you delete cookies for, so be sure you know your username and password.

I switched to mobile version once and I regretted it. Just asking, can you get the achievement of using mobile version of the game for 30 days by switching it to mobile version in PC?