You generally cannot officially revert Roblox Studio to the old UI
Roblox has been rolling out the new Studio UI and the old one is not fully available anymore
Check Studio settings for any UI or beta feature toggles that may still be available
Look in File, Beta Features, or Studio Settings for interface-related options
If you only want a different layout, try resetting or customizing the current UI panels
Search Reddit for recent posts about old Studio UI because availability changes over time
Avoid unofficial mods or third-party tools that claim to restore the old UI
If the old UI is required for a workflow, use feedback channels to request a rollback option