Specific to the seedsigner_os.0.7.0.pi4.img release.
There is not a startup message shown stating "You can remove the SD card now" like in the pi0 release.
Probably related, when navigating to Settings / Persistent settings, a message shows that persistent settings is disabled and the notification states to Insert SD card to enable. However an SD card is inserted when getting this message. Removing and reinserting an SD card still shows message stating to insert SD card.
Specific to the seedsigner_os.0.7.0.pi4.img release.
There is not a startup message shown stating "You can remove the SD card now" like in the pi0 release.
Probably related, when navigating to Settings / Persistent settings, a message shows that persistent settings is disabled and the notification states to Insert SD card to enable. However an SD card is inserted when getting this message. Removing and reinserting an SD card still shows message stating to insert SD card.