[Azure DevOps] Why the argument --window-size=1920, 1080 does not work in Azure DevOps?

Since the default resolution of all VMs of Microsoft hosted is 1024x768. This means that we cannot modify the value of the resolution higher than the default. Ex: 1920, 1080. Please refer to this link as a reference

The solution of that case is to use the Screen Resolution Utility plugin of Microsoft to modify the resolution value.

Also, we have a sample for more details.