@Kelly Vida We have customizable forecasting in our org currently and am aware that we cannot access the Forecast tab via lightning experience and if we do a message will pop up making us aware of the same.

But what I noticed is that in Lightning experience one is not able to edit the Territory associated to the opportunity as well. I was told that that aspect is a limitation too. Is that the case ? Please can you confirm this. Is it on the road map to perhaps allow editing the Territory field on the opportunity.Thank you. Regards, Vibha