In this dialog you may specify toolbar buttons to display when browsing a disk folder ("Show outside of archives" group of options) or viewing archive contents ("Show inside of archives" options). It is also possible to change the buttons order, just select buttons to move and press "Up" or "Down" to change their position. If you wish to restore the default toolbar configuration, press "Default" button.
"Separator" button inserts a separator line just before the currently selected button. If you need to remove a separator, either turn off its check mark or place the cursor to it and then press "Separator" button.
Additionally to this dialog you may also drag toolbar buttons directly on the toolbar while holding down the Alt key.