How Do You Remove App Icons from the Lower Screen

I found out how to add apps and have the icons show up on the lower screen. But I cannot find a way to delete Icons that I don’t want. I have too many sound icons. A 5 shows up on the apps page for that app but no matter how I click it there is no option to “Remove”.

You can hit the far right button to edit stuff on the panel including removing stuff. Hover over an element and press X to remove that element.
I am not sure however if those multiple volume applets are own plugins on the panel or simply addons of the systemtray that needs to be configured seperately.