How can I change the size of clustered features?

[barrylim]

Hello I created a webmap in ArcGIS Pro and shared it with ArcGIS Online. I clustered the symbols of my features, but now they are really small after zooming in. Even with the maximum Symbol Size they are a way to small. 

Does someone know how to change it?

Thx in advance.

First picture is before zooming in (symbols big enough)

Second is after zooming in (symbols too small)

[barrylim]

Im so frustrated right now 😞In my university course this year we just used the map viewer classic and I didnt know about the new one. I created this map in the classic map viewer and now it seems, I need the new map viewer to make the clustering working. But the new map viewer seems really complicated, more options are cool  but i just learned the classic one and now I need to adapt again -.- When I use the new map viewer and create a web app, I cant find the widgets I need to use like "near me" widget.......