IEC 61850 can not create tag in OPC Quick Client before connection

The tags in OPC Quick Client will only be generated after establishing a connection with the device. This is the case even if an SCD file is added.

Is there any way to improve this?

No, this isn't configurable, and appears to have been intentional.

I can't understand this design. After all, in most development scenarios, it's impossible to have the actual equipment.

Sorry, feel free to open a feature request.

Offline / simulation mode is something we're missing, either at the platform/tag level or at the OPC server level. It seems to be more of an impediment for some industries than others, which I suppose is part of the reason why we've managed to go this long without a solution.

I don't have any kind of timeline or roadmap I can offer but if it's any solace it's at least something we're aware of and thinking about for the future.

This issue has further implications, which I have already encountered.
For example, when the 61850 SERVER changes its IP, the generated REPORT will automatically update.
This has caused problems in my completed projects. Upon inspection, I found that the originally configured IP is no longer associated with the original IED device.