Every time I turn my MacBook on, the only way to boot into Mac OS is via the start up manager. It will always boot Windows 10 by default. How do I fix? This issue hasn't always been the case and only recently started (last couple weeks).
MacBook Pro 2019 16" running Catalina 10.15.4 (19E287) and bootcamp was used install Win10
MacBook Pro 16", macOS 10.15
What system is selected in System Preferences...>Startup Disk?
The Startup Disk setting is stored in the NVRAM which can become corrupted or it can be erased by a PRAM reset.
Wow. Um yeah that worked... That preference should never mysteriously change, but huge face palm on missing that one. Thank you!
You are welcome.
Thank you for the explanation! I recently reset my machine's PRAM in debugging a separate issue which coincides with this issue appearing.
Startup manager required on every boot
