Shiny Application Viewer Window Resizing

I am sharing a shiny application which is currently in development with someone I am working with. He is going to use the shiny::runApp command to run the application from R Studio for now. On my computer the size of the application GUI comes out perfectly but on his it is too long and gets squished so he has to scroll to get to fields he wants. Does anyone know how to set the size of the application GUI so this won't happen when running on his computer?
Thank you!

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