1. Select element or elements in a model.
2. Submit "3D Section Box". Straight away a section box is created and you can zoom for selection in 3D view.
3. If you want to resize the section box you can move the track bar in an application form or mouse scroll.
4. If application form already exists you can select other elements and move the track bar, then created a new section box and zoom.

The installer that ran when you downloaded this plug-in from Autodesk App store has already installed the plug-in. You may need to restart the Autodesk product to activate the plug-in. To uninstall this plug-in, exit the Autodesk product if you are currently running it, simply rerun the installer by downloading it again from Autodesk App store, and select the 'Uninstall' button, or you can uninstall it from 'Control Panel\Programs\Programs and Features' (Windows 10/11), just as you would uninstall any other application from your system.