SUMMARY Compare to Dolphin's "Details" view. This makes column titles feel frozen, or at least non-interactive. SOFTWARE/OS VERSIONS Operating System: openSUSE Tumbleweed 20250211 KDE Plasma Version: 6.3.0 KDE Frameworks Version: 6.10.0 Qt Version: 6.8.2 Kernel Version: 6.13.1-1-default (64-bit) Graphics Platform: Wayland ADDITIONAL INFORMATION This is possibly a problem in Kirigami or qqc2-desktop-style, but I couldn't find another table to verify, and I suspect this one to be the most prominent.
Can confirm.
System Monitor these days uses the standard HorizontalHeaderView control for its headers. So this is a bug in that control, moving to qqc2-desktop-style.