Such a strange way helped me.
On the bg3.exe file itself, in the compatibility settings, enable the option "Run this program as an administrator"
In Steam, in the game settings in the "launch options" option, specify the path to bg3.exe in this form
"C:\Program Files (x86)\Steam\steamapps\common\Baldurs Gate 3\bin\bg3.exe" %command%
Specifying the path where you installed the game.
Parameters must be with such quotes and percentages.
After that, go to Steam and before starting the game, hold down the Shift key until the game starts.
I understand that all this looks like some strange dances with a tambourine, but this allowed me to launch the game from the Steam client.
Thank you very much, it helped me. Health and happiness to you!
