The screens for these windows are located in the UI as WindowScreen; check WindowScreenShared, and if there is such a line (screenshot), try removing it.
The file in the screenshot is the Hall of Fame.
Yes, thanks, this generally works, although it's not always possible to pinpoint the background—it feels like it's linked differently somehow. In any case, I found out that the issue isn't actually with the backgrounds, but rather that the interface has gained new weight overall, and it's clear how the game reacts to this. I'll optimize where possible; generally, the FPS drop remains only in the kingdom menu during the summon/hire and hero call-up mode (does anyone even use the kingdom?) and in the arena hero view menu. In other areas, I've restored it.
Стой, где очерчен мелом круг! Как мне приятен твой испуг!