Setting screen resolution without Orchestrator

We have environment where we have UiPath Studio license at one Windows 2012 server and single Unattended robot license at Windows 2012 server. User version is 2018.3.

I have created workflow with Studio and now I should add it for execution with old time execution with Windows Task Scheduler at server with Unattended robot. I managed to execute workflow from Task Scheduler but problem is that screen resolution within execution is very small.

How can I change resolution for execution? Based on UiPath support UiPath.settings file is created only by Orchestrator and Start Interactive workflow Activity should not be used anymore. How to change resolution?