Window Mode for C1

I saw a "pinned" sticky with the explanation to make work L2 on window mode, but some people told me, that works for C2 only, and I need it for C1 (Priv. server). If anyone explains me how to do it on C1, please tell :)

Thanks a lot

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look a little bit more downwards...have a nice day

After some translations of babelfish :D I managed and worked :)

Thanks ;)