While looking for a suitable point symbol, you have to chose a category from a drop down menu as below:
Then you have to scroll through the symbols in this category until you find a suitable symbol. There is currently no way to search these symbols (although you can add your own symbology).
It would be really useful if tags could be added to each of these symbols so a user can simply search through the symbols (like in ArcMap and ArcGIS Pro pictured below).