The Syncfusion® native Blazor components library offers 70+ UI and Data Viz web controls that are responsive and lightweight for building modern web apps.
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SPSowmiya Padmanaban Syncfusion Team August 3, 2020 07:40 AM UTC
Hi Igor Surla,
Greetings from Syncfusion support.
We have checked your requirement with Sidebar component. By default, Sidebar Type property is set as Auto, so Sidebar component will render in expanded state on initial loading of the page.
For your reference, we have prepared a sample to open the sidebar on initial loading.