Open-Sankoré is not available in window mode. The software will always use all the surface of your screen.
However, it is possible to switch to “desktop” mode or to “mask” Open-Sankoré.
The “desktop” mode is accessible by clicking on the “Desktop” icon in the toolbar.
To hide Open-Sankoré you must use the command “Ctrl+H” under Windows and Linux or “Cmd+H” under MacOS.
You can also use the command “Ctrl+Tab” under Windows or Linux or “Cmd+Tab” under MacOS to pass from an application to another to create copy-paste for example.