Full Width doesn't expand Whatsapp to full width [Bug Report]

[Rattlyy]

Describe the bug
Full Width option doesn't expand Whatsapp to full width
WALC Installation Type: AppImage

To Reproduce

1. Enable full width

Expected behavior
Full width option fills entire screen
Did you try closing and then opening it back?: Yes

Screenshots

System Information (please complete the following information):

• OS/Distro: KDE Neon