Welcome to the WPF feedback portal. We’re happy you’re here! If you have feedback on how to improve the WPF, we’d love to hear it!>
Thanks for joining our community and helping improve Syncfusion products!
Thank you for adding Windows 11 theme. I noticed there are a few bugs in the theme for SfTreeView when creating a custom theme with Theme Studio. The selection highlight is fixed at a height of 20 and does not follow the height of the content. Here is a sample:

I made a few changes to the theme to remove the fixed height for the selection and hovering, and also made the selection indicator height relative to the height of the selection content.
Removed Height="20" in "BorderContent"
Removed Height="20" in "PART_HoverBorder"
Removed Height="12", changed margin to Margin="1,8,0,8" in "PART_SelectionIndicator"
