It should be possible to use Roblox Studio offline - Studio

Personal Server, Roblox Wiki

🔴[ROBLOX GAME DEV][LIVE]🔴 Working on Bridges!

Can you play Roblox games without internet?

Studio is impossible to use offline - Studio Features - Developer

Release] Offline roblox studio - Creations Feedback - Developer

Can't publish without closing and opening the game - Studio Bugs

It should be possible to use Roblox Studio offline - Studio

How to Make Avatar Clothing Items & Shirts in Roblox

Release] Offline roblox studio - Creations Feedback - Developer

If ROBLOX ever gets an offline mode, this is how it should

Why does my roblox studio do this? - Platform Usage Support