Resize one foliate instance, the other foliate instance would also follow

[Winston Ma]

Describe the bug
Since I am using two screen, I opened two foliate. Two instances open two different books, when I resize one instance, the other instances follow.

To Reproduce
Steps to reproduce the behavior:

1. Open Foliate with one book
2. Open another Foliate instance and open another book
3. On one instance, toggle full screen by using keyboard F11
4. The other instance would toggle full screen also

Expected behavior
Two instances should be independent. So if I resize one instance, the other instance should not be affected.

Screenshots
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Version:

• Foliate version: 3.1.1
• OS/Distribution and version: Ubuntu 24.04
• Desktop environment: GNOME 46
• Installation method: Flatpak

Additional context
Add any other context about the problem here.