I'm new to Blazor I'm trying to override(nuget package) RadzenDataGridGroupRow.razor is it possible; I want to add the feature of not showing the Group header/footer if the GroupResult.Count === 1? and example would be appreciated. Thank you.
In general you cannot override a nuget package. They are packaged and there is no easy way to replace certain parts of them.
You will need a fork of Radzen.Blazor. You can clone the github repository and use a <ProjectReference />
to it as we do in our sample application:
<ProjectReference Include="..\Radzen.Blazor\Radzen.Blazor.csproj" Condition="'$(Configuration)' != 'Release'" />