Developer Tools Settings

Settings page can be accessed from the Tray Icon menu (on Windows and Linux) or macOS global menu. Or, alternatively, when app is already connected, settings page is available on the left navigation bar.

Category	Setting	Description	Default Value
Appearance
	Theme Variant	Controls the application's color theme	Dark
	Exit On Last Window Close	Determines if the application should exit when the last window is closed	true
	Skip Welcome Window	Bypasses the welcome screen on application startup	false
	Enable Protocol Monitor	Shows diagnostic communication protocol monitoring window	false
Elements Tree
	Aggregate Templates	Combines template visual children into a single tree node for cleaner visualization, collapsed by default	true
	InlinePseudoclasses	By default, only visible element pseudoclasses are right-aligned in the tree, and the rest is hidden in the overlay button. This settings allows to inline all pseudoclasses regardless of their visibility.	false
	Contextual Properties	Only shows properties relevant to the current context/state of the selected element. For example, Grid.Row property only visible on direct Grid children	true
	Include CLR Properties	Displays .NET CLR properties in addition to Avalonia-specific properties, excluding duplicates	false
Overlay
	Show ToolTip Info	Displays tooltips with control information on hovered element	true
	Visualize Margin & Padding	Highlights margin, padding and border areas of hovered element	true
	Show Rulers	Displays measurement rulers for precise element positioning	true
	Show Extension Lines	Shows guide lines between hovered element and ruler	true
Events
	Default Routed Events	List of events to track by default in the events tool	Button.ClickEvent, InputElement.KeyDownEvent, InputElement.KeyUpEvent, InputElement.TextInputEvent, InputElement.PointerReleasedEvent, InputElement.PointerPressedEvent
Metrics
	Observable meters polling interval (ms)	How frequently observable meters are polled for new values. Lower values provide more frequent updates but may impact the connected app's performance.	1000ms
	Measurements frame interval (ms)	How frequently metrics measurements are captured and updated in the visualization.	250ms
	Aggregate frame measurements	When enabled, combines multiple measurements within the same frame: averages time-based metrics and uses latest values for counters and gauges. When disabled, keeps all raw measurements.	true
	Measurements history duration (s)	Defines how long in the past measurements are kept and displayed.	60s
Protocol
	HTTP port	Defines HTTP port used to listen for app connections. Requires restart on change. Needs to be in-sync with DeveloperToolsOptions.Protocol set-up in the target app.	29414