In XComGameCore.ini, at line 2239, there is a config +NoPeekInYellowAlert=true
According to the preceding lines, setting this to true (default value) should prevent pods from peeking around cover once they enter yellow alert, which potentially causes them to see XCOM units when they didn't prior. However, this does not appear to be functional. Pods that enter yellow alert will start peeking around corners, potentially activating then mid-way through the XCOM turn, such as if they hear gunfire.
In XComGameCore.ini, at line 2239, there is a config
+NoPeekInYellowAlert=true
According to the preceding lines, setting this to true (default value) should prevent pods from peeking around cover once they enter yellow alert, which potentially causes them to see XCOM units when they didn't prior. However, this does not appear to be functional. Pods that enter yellow alert will start peeking around corners, potentially activating then mid-way through the XCOM turn, such as if they hear gunfire.