XF 1.5 is this is un options or just a custom made ?

[UAEReactor]

please see the attachment how the forums are listed .. are this custom made or just options in admin panel ?

 

[Martok]

If you mean the side by side grid format, that's not a standard feature. It is available from several styles and style authors including the one in your screenshot. I believe there's an add-on too that adds this feature, check the Resources section to find it.

 

[n00bsaibot]

@Mike Creuzer posted the instructions to get the effect via CSS.

https://xenforo.com/community/resources/side-by-side-nodes.2449/