1) Arrange applications in a layout 2) Expect that the layout will be there on next login 3) Do a REBOOT 4) Session / layout appears to not be remembered 5) Restores some previous layout *) To save / remember the layout it's currently required to LOGOUT. #) It should remember / save it on reboot too. Note: I reboot using 'sudo reboot' I'm on Plasma 5.17.2
This somewhat/partially/mostly works in Plasma 5.20 on X11 with KDE apps that support it. In the future it will be possible to do it generically on Wayland via Bug 15329. *** This bug has been marked as a duplicate of bug 15329 ***