How to Change Timeline Frame Rate
Open Project Settings from the gear icon, select Master Settings, and find Timeline Format. Choose the Timeline frame rate required by the project before importing and editing media. The timeline rate defines the timebase used for cuts, effects, keyframes, and playback timing.
If the project already contains an established timeline, create a new timeline when the existing rate is locked. In the New Timeline dialog, disable Use Project Settings and choose a custom timeline frame rate where available. Copy the edit only after checking retiming, transitions, titles, and audio synchronization.
Do not select a frame rate only because the number is larger. A 24 fps narrative edit, 30 fps web presentation, and 60 fps sports sequence communicate motion differently and may have different delivery requirements. The source material and intended platform should drive the timebase.