It seems to me that you are trying to modify the settings of the View that is the source of the Drawing placed on the Layout.
Go to the View Map and reserve the View you wish to modify, then the OK button should become enabled.
Loving Archicad since 1995 - Find Archicad Tips at x.com/laszlonagy AMD Ryzen9 5900X CPU, 64 GB RAM 3600 MHz, Nvidia GTX 1060 6GB, 500 GB NVMe SSD 2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac27
You reserved the View Set. Is there now a little green dot next to the View you wish to modify? Or can you also select that specific View and reserve that? (Sorry, I don't have BIM Server running so I am relying on memory on how this works.)
Loving Archicad since 1995 - Find Archicad Tips at x.com/laszlonagy AMD Ryzen9 5900X CPU, 64 GB RAM 3600 MHz, Nvidia GTX 1060 6GB, 500 GB NVMe SSD 2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac27