2. Then place the mouse cursor on the gear in the upper right corner, and some options will appear. Click "Space Settings":
3. Then, enter "Synchronization Settings" in the first option of space settings:
4. In the synchronization settings on the right, the QQ signature is synchronized. The first item is that "Synchronize QQ signature to space" is checked by default:
5. So just remove the check in front of "Synchronize QQ signature to space", and then click "Save" below, and the prompt of successful saving will appear: