PDF24 Creator as default Tool upon starting PDF24?

Hello,

yes, for the PDF24 icon in the notification area:

1. Right-click the PDF24 icon in the notification area and choose "Settings".
2. Open the page "Tray Icon" and choose "Creator" in the drop-down list.
3. Click "OK".

After that, a double-click on the PDF24 icon or "Open PDF24" in its menu opens the PDF24 Creator. Administrators can set the same with the registry value trayIcon.openTool = creator: https://creator.pdf24.org/manual/11/#49-registry-settings-related-to-pdf24-tray-icon

The "PDF24" entry in the Start menu and the "PDF24 Toolbox" desktop icon always open the Toolbox. If you want an icon that opens the PDF24 Creator directly, create a shortcut to pdf24-Creator.exe in the PDF24 installation folder (by default C:\Program Files\PDF24\pdf24-Creator.exe). In the Toolbox itself, the tile "Open PDF24 Creator" opens it as well.