This document is a guide detailing the new features introduced in Arrow 11. It outlines the enhancements made to various tools and functionalities within the software. The Scenario Comparison Layer allows users to visually compare multiple scenarios through graphical overlays in the Workspace. The Library Manager has been revised for better customization of libraries. Users can analyze alternatives using Multi-Scenario Graphing and convert Shear Rheometer data for viscosity models. The document describes the introduction of a new Analysis Setup menu that simplifies the workflow. It also highlights the Parametric Study tool for evaluating different parameter combinations. Additionally, the guide presents improvements in graph annotations, control valve sizing, and the ability to import multiple PCF files. Other notable features include enhanced model building tools, improved UI, and new loss models for flow coefficients. The guide serves as a comprehensive resource for users to understand and utilize the new functionalities effectively.