Restart Visual Studio after installation. The DevExpress controls should automatically appear in the Visual Studio Toolbox. If they do not, manually add them:

This minor update improved VerticalGrid, TreeList, and Scheduler controls. Fixes addressed complex grouping issues in reports and resolved the issue where changes to static XRRichText were lost upon opening localizable reports.

: This release saw a massive expansion of the Blazor component library, including new Accordion, File Manager, and Breadcrumb components.

If you want, I can:

Why is version 21.1 still highly regarded? It brought several "firsts" and major overhauls to the component suite. WinForms & WPF Enhancements