In DevTest Portal, updating the concurrent capacity or adding more columns for Virtual services, the Portal layout changes to default layout. Ideally it shouldn't change the selected layout.
Service Virtualization 10.8.x
There is a patch available for 10.8.4 and issue is fixed in Service Virtualization 10.9. If anyone looking for a patch in 10.8.4, please open a support case and refer DE647091 and request for the patch phoenix-10.8.4-DE647090-DE647091.war and instructions.