This item has been identified as an outstanding known issue. A workaround is provided below.
In the New Modelling Experience when using the pop out formula editor, user is unable to select List or List properties.
Manually copy the name of List item, then include it in the formula
If this workaround is not suitable in your use case, please contact Support at email@example.com.
Go to Solution.
This issue has now been fixed.
View solution in original post