I was trying out the native wayland support in SDDM git and found that the cursor looked way to big. The problem was easily fixable by setting 'CursorSize=24' in sddm.conf.d. However, this should probably be synchronized as well when the user presses the "Apply Plasma Settings" button.
STEPS TO REPRODUCE
1. Upgrade to sddm-git
2. Switch sddm to wayland with 'DisplayServer=wayland'
3. Synchronize settings from plasma
Currently synchronizing the Plasma settings to sddm gives me this kde_settings.conf:
Font=Noto Sans [GOOG],10,-1,5,50,0,0,0,0,0,Regular
The CursorSize setting is also synchronized automatically, leading to a uniform cursor size when logging in and loading a Plasma session.
Linux/KDE Plasma: Gentoo Linux 6.3.0_rc1
KDE Plasma Version: 5.27.2
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8
A possibly relevant merge request was started @ https://invent.kde.org/plasma/sddm-kcm/-/merge_requests/41
Git commit 650098c27f1a8c6b2ccba448c2c0aead57ca9a45 by Nate Graham.
Committed on 14/03/2023 at 20:23.
Pushed by ngraham into branch 'master'.
Sync cursor theme too
SDDM supports this; let's sync it.
M +1 -1 src/package/contents/ui/main.qml
M +6 -0 src/sddmkcm.cpp