Thanks for the info Russell Roberts. Initially I had the slider set at 'balanced' and switching to 'performance' actually did increase the font size in the web scene but not in my web application. Per your instruction I set the optimization to 'quality' and the font size in the web scene did not increase at all compared to the 'balanced' setting. None of these setting have any effect on the font size in my web application.
I see that in the ArcGIS Vector Tile Style Editor (beta)(where I created my vector tiles), there is a a layers button where you can go in and alter all of the label sizes. Is this the best way to do this? It would be really cool to be able to edit them directly in the JSON. Is there a way to extract the JSON, edit it and then load it back into ArcGIS Online?
Is altering the the font size in the vector tile editor the best way to go or is there a quicker way?
thanks for all the info,
Tyler