Hello, I use Blazor Radzen in a Visual Studio .Net 5.0 Blazor Client WASM project. I built a menu using v2.18.15 without issue. I just updated to v3.0.10 and I'm getting weird menu results. The problem corrects itself when I roll back to v2.18.15. See pics below before & after:
According to the code you are using one of the professional themes not available in the Radzen.Blazor free components. We recently reworked our themes and if this application is generated by Radzen you can regenerate it again using Radzen. More info can be found here: Migrating from Radzen.Blazor 2.x to 3.x