In VScode-R, how to close previous plots tab, when refreshing plots using dev.list()?

Question

I am using httpgd as the default graphic devide for R in vs code. if I don't use dev.list(), it will open up new plots in the same tab everytime a new plot is generated. If I use dev.list(), it will open up a separate tab for the new plot. But how do I close the tab which stores previous plots? Thanks.