Highcharts - How do I change the filter styling?

Question

In highcharts (bubble) I have a filter. The problem is that when applied, it renders the filtered data in a really ugly manner.

This is an example of the code when I inspect the element:

<circle fill-opacity="0.5" fill="rgb(255,255,255)" stroke-width="2" stroke="#000000" r="230.5" cy="491.60872727272726" cx="579"></circle>

I would like to simply have bubbles that get removed to disappear completely and my remaining bubbles to remain as they were (transparent fill and 1px #000 solid border)

Any hints on how to achieve this?

Thanks Jacques EDIT - screen captures added: