Cannot boot into Mojave from Home windows 10

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Greetings,
I’ve efficiently put in Home windows 10 on a separate SSD in Mac Professional 2012.
The main points are as follows:
Mac OS: Mojave, model 10.14.6 put in on HDD – GPT – Mac OS Prolonged Journal – Drive Bay 3
Home windows OS: Put in on SSD (SATA 860 EVO) Home windows 10 Legacy Model 20h2 – MBR – NTFS – Drive Bay 4
BootROM: 144.0.0.0.0
GPU = Radeon RX570, as in I’ve no boot display screen
Set up course of:

version 1803. made a DVD with
Used Brigadier to get Apple Drivers and Bootcamp Control Panel

Windows upgraded to version 20H2
Advanced AMD Drivers
Used brig again for apple drivers and bootcamp control panel

To play safe, I installed the Legacy option for Windows and don’t want to use Open Core.

While I can access and change the startup drive in Bootcamp Control Panel, my system always starts in Windows, even if I select Mac OS.

What am I doing wrong? Do Mac OS and Windows need to be installed on the same drive for Bootcamp to work?

Any advice much appreciated.

Cheers Bernado

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