Remove not needed packages?

Installing and Using OpenWrt
1

Hi there,
while i play currently a bit around with lede and my new router i`ve installed a bit too much i think (strongswan-full for example).
When i now run
opkg remove "strongswan-full" --autoremove
i still see under https://routername/cgi-bin/luci/admin/system/packages not as much free space as before installing strongswan-full...so how to cleanup the rest?

Thanks for help

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