Sometimes you may want to go offline intentionally to prevent updates from interrupting your work or to save bandwidth. Click the icon (the clock) in the top right. Toggle the switch to Work Offline .
At this point, Fusion 360 will upload any files you saved locally. If a teammate edited the same file while you were offline, Fusion 360 will prompt you to save your version as a new copy or a separate version to avoid overwriting their work. fusion 360 offline mode
Right-click the design you need and select "Add to Offline Cache." Sometimes you may want to go offline intentionally