If you see that your resolution changed to lower than 800x600 for some reason, you may try the following steps:
- Launch Windows registry: WIN+R → type 'regedit' in the text field → 'OK';
- Find this directory: HKEY_CURRENT_USER\SOFTWARE\Pixonic\War Robots Steam;
- Find these two parameters there:
- Screenmanager Fullscreen mode Default_h401710285
- Screenmanager Fullscreen mode_h3630240806
- Set their values to 1.
Alternative way of doing this you may find here.