Tabs, panels, or other controls are missing from the …
https://knowledge.autodesk.com/support/autocad/troubleshooting/caas/sfdcarticles/sfdcarticles/Tabs-or-panels-are-missing-from-the-ribbon-in-AutoCAD.html
On the status bar, click Workspace Switching (gear icon) and select the workspace. Select a different workspace on the Quick Access toolbar. Type WSSETTINGS on the command line and select a new workspace in the "My Workspace drop-down menu." Customize the user interface to add missing tabs, panels, or other controls (see To Customize a Ribbon Tab).
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