App Deploys in Tiny Section of Browser Window

,

I think this is a pretty simple problem, I just can't seem to solve it.
I am deploying my shiny app on shinyapps.io, but it shows up in a pretty small section of the browser window. I have to scroll within the window to see all components, which is pretty annoying.
Is there a way to increase the size of the deploy window? If I run the app just from the RStudio it works fine - its just small if I run from shiny apps.io.
Thank you!!

It would be great if you could show us your code or link to your webapp.

Could be issues with css?