A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
This is not available under any tab. You can access this from File > Info > Protect Presentation.
Also, you can add this to QAT (Quick Access Toolbar)
ALT+T+O (or File > Options) > Quick Access Toolbar > Select All Commands in Blue Zone > Now press R in below which will make you reach the entries starting R > Scroll down to Restrict Access and Add it to QAT