My home network has NFS homedirs, and so it doesn't matter which computer or laptop family members log into. They get all their files.
Now, one of the PC's has a 40 inch monitor, and users prefer a text-scaling-factor of 2 when using that PC.
Changing their personal settings means changing it back again; fortunately a system-wide default of 2 can be set on that PC, and apply to all users that don't override the system value.
Edit the text-scaling-factor in the schema:
sudo nano /usr/share/glib-2.0/schemas/org.gnome.desktop.interface.gschema.xml
and rebuild the schema:
sudo glib-compile-schemas /usr/share/glib-2.0/schemas
And then to reset the users custom value (if any):
gsettings reset org.gnome.desktop.interface text-scaling-factor
But doing the same for org.cinnamon.desktop as I do for org.gnome.desktop
Also default-zoom-level to larger and default-use-tighter-layouts to true, in /usr/share/glib-2.0/schemas/org.nemo.gschema.xml