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once you check the "Raise max volume" box no matter if you uncheck it or not later on, the volume and brightness change popup {on fn keys} always shows full volume or brightness on the linear slider or meter.

OS: Manjaro Linux x86_64
Host: 20RAS0SE00 ThinkPad E14
Kernel: 5.9.16-1-MANJARO
Uptime: 4 days, 15 hours, 48 mins
Packages: 1214 (pacman)
Shell: bash 5.1.0
Resolution: 1920x1080
DE: Plasma 5.21.1
WM: KWin
Theme: Breath2 [Plasma], Emacs [GTK2/3]
Icons: Papirus-Dark [Plasma], Papirus-Dark [GTK2/3]
Terminal: konsole
Terminal Font: Hack 13
CPU: Intel i3-10110U (4) @ 4.100GHz
GPU: Intel UHD Graphics
Memory: 2200MiB / 3743MiB

Brainstorm is not the correct place to file bugs, please do this on https://bugs.kde.org