There are a few different ways to reset the GUI layout as outlined below :

Graphical Option

To reset the Simcenter STAR-CCM+ window layout, click on Tools > Reset Options... under the Simcenter STAR-CCM+ menu toolbar and enable the Window Layouts option from the window shown below.

Restart Simcenter STAR-CCM+ to apply the change.

Delete all Local Settings Directories

Windows

To reset your GUI and other settings for a specific Simcenter STAR-CCM+ version, you have to open your file explorer and switch on to see Hidden Items, which is highlighted in the screenshot below. For example, on Windows 11, view the hidden items could be located under View options or through options dialogue.

Then navigate to C:\Users\YourUserName\AppData\Local\CD-adapco (versions prior 2502 - 19.02.XXX) or to C:\Users\YourUserName\AppData\Local\Siemens (2502 onward - 19.02.XXX version) , as shown in the screenshot below. Here, you find a different folder for each version of Simcenter STAR-CCM+, depending on how many different versions had been installed and used on the specific computer and user. Delete the folder corresponding to the version for which you have problems, or you want to reset the settings. The next time that you start Simcenter STAR-CCM+, the folder will be recreated with the default Simcenter STAR-CCM+ settings.

Linux

To reset your GUI or other settings for a specific Simcenter STAR-CCM+ version in Linux, you have to open a file explorer and switch on hidden items (in Linux, they are folder and files which start with a period "."). Navigate to your home directory, where you find different Simcenter STAR-CCM+ folder. Delete the folder for which you want to reset the settings. In many Linux File Browsers, such as Nautilus, hidden folders and files can be made visible using the CTRL+h shortcut.

Command Prompt

Open a command prompt and type 'starccmw.exe -reset'. Make sure you are using right version of .exe or else enter full path, for example:

C:\Program Files\Siemens\20.02.007\STAR-CCM+20.02.007\star\lib\win64\clang17.0vc14.2\lib> starccmw.exe -reset

User Guide:

Home > Getting Started > Simcenter STAR-CCM+ Default Options > Resetting Simcenter STAR-CCM+ Default Options,
Home > User Interface.