使用Leaflet / Shiny选择和取消选择多个多边形时更改样式

I'm having some problems changing polygon styles when selecting and deselecting polygons in a Leaflet Shiny app I'm working on. In my current app, when you click on a polygon, that polygon is highlighted with a different color. Ideally, I want the user to be able to select and highlight multiple polygons. I also want the user to be able to re-click a single highlighted polygon to deselect it.I'm having some problems changing polygon style