This example shows how to change the viewer options. First, load scripts:

@using Stimulsoft.Base
@using Stimulsoft.Report
@using Stimulsoft.Report.Blazor
@using Stimulsoft.Report.Web

Next, add report viewer:

<!--Report Viewer-->
<StiBlazorViewer Report="@Report" Options="@Options" 
                 Theme="StiViewerTheme.Office2013WhiteCarmine" />

After that, initialize options object:

@code
{
    //Report object to use in Viewer
    private StiReport Report;

    //Viewer options object
    private StiBlazorViewerOptions Options;

  	protected override async Task OnInitializedAsync()
    {
        await base.OnInitializedAsync();

        //Init options object
        this.Options = new StiBlazorViewerOptions();

...

Finally, set some options, create empty report object and load report template:

...

		//Set some options
		this.Options.Appearance.FullScreenMode = true;
		this.Options.Appearance.ScrollbarsMode = true;
		this.Options.Toolbar.ShowOpenButton = false;
		this.Options.Toolbar.DisplayMode = StiToolbarDisplayMode.Separated;

		//Create empty report object
		this.Report = new StiReport();

		//Load report template
		var reportBytes = await Http.GetByteArrayAsync("Reports/TwoSimpleLists.mrt");
		this.Report.Load(reportBytes);
    }
}

In the screenshot below you can see the result of the sample code: