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If we call the focus method on created event, the selection start will be updated as selection end i.e., the cursor will displayed at the end of the input. Please find the sample and screenshot below.
@using Syncfusion.Blazor.Inputs <SfMaskedTextBox @ref="maskObj" Mask='000-000-0000' Created="OnCreate"></SfMaskedTextBox> @code{ SfMaskedTextBox maskObj; public async Task OnCreate() { await maskObj.FocusAsync(); } } |

Replication procedure: