Remove Old-Style Blue Windows Header? (Scrivener)

I’m running Scrivener in Lutris, and since the upgrade, there’s been a brand new, very 90’s looking, Windows header at the top:

image

I have tried this solution, but it didn’t change anything:

image

Any suggestions?

OS: Debian GNU/Linux 13 (trixie)
Hardware: Lenovo ThinkPad T14 Gen 2i, 11th Gen Intel® Core™ i5-1145G7 × 8, 16.0 GiB