According to Archlinux-wiki , To use WICD you need to disable other network daemons (netctl, netcfg, dhcpcd, NetworkManager)
> Warning: Running multiple network managers will cause problems, so it is important to disable all other network management daemons.
>
> First, stop all previously running network daemons (like `netctl`, `netcfg`, `dhcpcd`, `NetworkManager`). Disable any existing network management services, including `netctl`, `netcfg`, `dhcpcd`, and `networkmanager`
You can find a list of the currently running services with `systemctl --type=service` and then stop them.