The Content property of the TitleBar should not have its HorizontalAlignment forced to Center; it should be bound to the actual content’s property.

https://github.com/microsoft/microsoft-ui-xaml/blob/adae19431771d29b4c94d7a2bfd889e7d8c0fa4c/src/controls/dev/TitleBar/TitleBar.xaml#L268
I need the content to be left-aligned, similar to Visual Studio.

Open src/controls/dev/TitleBar/TitleBar.xaml at the linked line and inspect how the Content property's HorizontalAlignment is set. Verify the desired left-aligned behavior with custom content, then confirm that the content follows its own alignment property without changing other TitleBar layout behavior.

Written by the indexing model from the issue text.