How come my screen saver doesn't show when computer first turned on?
Instead an apple screen saver until I log in? Since Catalina only.
Question marked as
Well it is not the screen saver you are referring to it is the desktop picture, check here: About the screens on your Mac as it starts up - Apple Support and read the login window section.
Yes for me it also never happened until I upgraded but the above link says it is normal.