Following big sur update, macbook pro did not recognize thunderbolt display in windows side(bootcamp windows)

Zeki_y wrote:

In the bootcamp control panel on windows 10, now there are two windows icons: Bootcam windows and untitled 3 windows. Mac icon disappers now. In the bootcamp control panel on windows 10, now there are two windows icons: Bootcam windows and untitled 3 windows.

Does Windows boot properly, if either icon is chosen?

In the bootcamp control panel on windows 10, now there are two windows icons: Bootcam windows and untitled 3 windows. Mac icon disappers now.

The AppleControlPanel.exe should recognize APFS. However, Big Sur changes APFS significantly, which causes the Bootcamp Control Panel from recognizing the newer APFS version. I expect a Bootcamp Update (How to use Apple Software Update for Windows - Apple Support) to rectify the issue in the near future.

And, after update, in the start up, I see "EFI boot" instead of windows. Moreover, when I plug Apple Thunderbolt display to any Thunderbolt ports on my macbook pro, the alt option to select the system (Mac or Windows) in the startup does not work. After the update, I can select the operation system in the startup when not plugged it in..

The boot process in Big Sur is different. As a test, disable Secure Boot (About Startup Security Utility - Apple Support) temporarily, and test. Be aware that in previous versions you could connect an external storage device to the TB display and boot from it using Alt/Option.

Also, see Security features on your MacBook Pro - Apple Support for reference.

Disconnect the TB display, reboot and hold Alt/Option, and before you select any OS, connect the TB display. Check if you are able to see the selections on the TB display.