Sequence > Sequence Settings (or right-click sequence > Sequence Settings) > Video tab.
At the bottom: and Title Safe percentages. safe margins in premiere pro
When in doubt, ask for the QC (Quality Control) spec sheet from your client. Never assume "safe" means the same thing to everyone. If they can't provide a spec, use 85% for text and 90% for action —it's the safest compromise for modern flat-panel TVs. Sequence Settings (or right-click sequence >