If you’re presenting a timeline, or just looking something up, you may want to prevent any accidental edits to your document. Use View ▸ Viewing Mode to switch this mode on or off for the current document. In Viewing Mode, all Inspector fields are read-only, and clicks and drags in the timeline never move or edit anything, but you can still adjust the time scale, switch timeline configurations, apply filters, perform exports, or do anything else which doesn’t modify the timeline content.