how can i apply a layout to the whole assets under a certain site and without affecting the other sites under matrix?
or simply apply a layout on a single asset when accessed in simple edit mode.
i tried applying it through the link manager and the layout was applied to all site that was under the system.
Simple edit layouts can only be applied system-wide. We are currently building a feature to allow you to set them like designs (per site, section or asset) but this will not be ready until version 3.20.0; around Sep this year.