The Root Settings and Properties Windows
The root node is the topmost level of the Model Builder tree and the Explorer tree in the Application Builder. When you click this node, the Settings window for the root node (, or in the Application Builder) opens and includes detailed information about the model file. To open the corresponding Properties window, right-click the root node and choose Properties from the context menu.
Root Settings Window
Some of the fields can be edited directly in this window, while others display system information that cannot be changed, or information that changes as updates are made throughout the model (for example, adding a node that requires an additional module license).
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Protection: Click Set Password next to Editing not protected or Running not protected to enter a password in the Protect Edit with Password or Protect Running with Password dialog boxes. To change the password, click Change Password to enter the previous password and a new password in the Protect Edit with Password or Protect Running with Password dialog boxes. Note that, for the password that protects editing, lost passwords cannot be recovered.
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Used Products: The information included here is based on the purchased license or modules. See Checking and Controlling Products and Licenses Used. Also see The About COMSOL Multiphysics Box.
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Presentation: In this section you can specify a title and a description of the model. By default, these texts are used on the title page of a report; see The Title Page. Under Computation time, you can enter an expected computation time in the Expected field. Also, the time after Last is the last measured computation time (if available). To illustrate the model you can also set an image as a thumbnail that displays in this section, when opening a file in the Application Libraries window, and as the default report title page image. See the section Setting and Clearing the Thumbnail Image for details about how to do this.
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Unit System: The default unit system is SI units. Or select any other option from the list. See Unit Systems and Setting the Unit System for Models to change the setting globally or locally.
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Graphics: For specifying the color theme used for selection colors, use the Color theme list, where you can select from all available color themes. The default is to use the default color theme — for example, Default from preferences (Default). You specify the default color theme in the Preferences dialog box, in the Color theme list on the Graphics and Plot Windows page. See Selection Colors for more information about selection colors.
For the Font settings, the default is to use the font family that is set in the Preferences dialog box — on the Graphics and Plot Windows page under Default font — with a default font size. Depending on the operating system and the installed fonts on the computer, you can select from a number of other font families from the Family list. The default font is indicated in the default settings for Family (Default from preferences (Vera), for example). For the font size, the Default size setting in the Size list uses the font size that is used in the graphics and plots, which is a system-dependent value. You can also choose another font size between 6 and 24 points or type a font size in the Size combined field and list. The font and the font size affect text in the Graphics window and other plot windows in the COMSOL Desktop and in Graphics form objects in the Application Builder. See Changing the Font for Plot Labels and Titles to make global changes.
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Applications (this section is only available from the Application Builder window): Select the Ask to save application when closing check box to ask users if they want to save changes in an application when closing it. Also, from the When starting with COMSOL Multiphysics list, you can control the behavior when a user starts COMSOL Multiphysics with the option to open an application or when a user double-clicks an MPH-file in Windows: Select Edit application (the default) to open the COMSOL Desktop for editing the application, or select Run application to launch and run the application directly.
Select the Ignore license errors during launch check box to make it possible to start the application even if not all required licenses are available. It is, however, still not possible to use products when the license is not available, so available API methods will typically have to be used in the application to limit the application’s functionality depending on what licenses are available.
Root Properties Window
To access the Properties window, right-click the root node and choose Properties from the context menu.
You can change a filename by saving the file, but the root node Name (root) cannot be changed for this top level node. This is different than for other nodes in the tree, where the name can be edited. See Displaying Node Names, Tags, and Types in the Model Builder for information. Also see Settings and Properties Windows for Feature Nodes.
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File: The file location where a file is saved. This field cannot be edited, but is automatically updated when the file is saved to a new path. Also see Documentation and Application Libraries Root Directories.
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Version: Includes the version and build of the COMSOL Multiphysics instance that you are running. This information is system generated.
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Created and Last modified: These sections cannot be edited and are automatically generated based on the computer system or network time and date settings.
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Saved with license: The license number of the installed software that the model or application was saved with is included here. Also see The About COMSOL Multiphysics Box.
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Application version: Enter a tracking version number for the model or application (for example, Internal Draft V1, Sales Demonstration V2, or Version B).
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 Search path: Enter a file path to set a search path for external files. This path corresponds to model.modelPath(<path>) in the COMSOL Multiphysics API.