Hello Ahmed
Have you opened the project with SOFiPLUS(-X) or with AutoCAD?
It could be that your standard app for .dwg files is AutoCAD. So if you open a SOFiPLUS(-X) file via double-click, the file is opened with AutoCAD.
In SOFiPLUS(-X) you can try to use the command “sof_g_gexplorer” to enable the sidebar.
If this command does not reveal the sidebar, the sidebar might be hidden on a secondary screen.
Best regards
Frederik Höller
Your SOFiSTiK Support Team