In KWin’s new (off-by-default) “Hide Cursor” effect, you can now turn off hiding it after inactivity, and only hide it while typing (Vlad Zahorodnii, Plasma 6.2.0. Link)
Does Plasma Bigscreen still receive updates? This feature would be very useful with it. Arch’s bigscreen package is unfortunately stuck at 5.27
New driver may have failed to load. Use “nvidia-smi” to query driver status and do a full system update.