Problem with designer in RB4VS

When I try to open my .razor page in designer mode I receive just white blank window. No error, not any other problem, just blank not editable window instead design time razor.

How to fix it?

Hi @Djordje,

Is there anything in the Radzen output window? Go to View -> Radzen Blazor for Visual Studio -> Output

Nothing suspicious:
Starting Radzen.Server on port 4000
Connected to Radzen.Server
Waiting for any pending restore operations...
Restore complete.
Solution is up to date.
Opening project E:\RadzenApp\EcoODS\EcoMatrix.sln
Finished building E:\RadzenApp\EcoODS\EcoMatrix.csproj
Finished building E:\RadzenApp\EcoODS\EcoMatrix.csproj

We are not sure what could cause this problem. You can send us your app to test at info@radzen.com .