Expression Preview Pane v2

The Preview pane in the designer console at the bottom of the screen lists evaluated compile-time samples for Expressions defined on Properties in Workflow Steps.

Availability

Preview becomes available after the current saved Workflow definition validates and compiles. It is unavailable when blocking diagnostics prevent compilation or the Workflow does not yet have a persisted key.

Preview does not invoke external Nodes.

Columns and groups

Rows are grouped by Workflow Parameters, Step, or Workflow Returns and show:

Column	Meaning
Type	Authored target Property type.
Property	Property name or nested path.
Expression	Authored Expression text.
Result	Evaluated sample, formatted for display.

Only Properties with an authored Expression appear as rows. Literal Values are not included.

Navigate and search

Click a row to select the corresponding Property on the Canvas. The handler supports Workflow Parameter/Return pseudo-Steps and nested ordinary Step Properties.

Search matches Step name, Property, Expression, and result. Search mode highlights matching rows while keeping the list. Filter mode shows only matching rows.

Empty states

• No preview available — resolve compilation errors or persist the new Workflow.
• No expressions to preview — the current compiled definition has no authored Expressions.
• No matching results — clear or change the active filter.

A blank or null Result can mean that no useful design-time sample exists. Use a controlled Debug to verify values that depend on an external call.

See also

See Preview an Expression, Expression Syntax, and Problems Pane.