I would LOVE to get this feature back!!!
Please bring it back
Thanks for reporting this! This might have snug in with our recent addition of details to the heatmap dropdown entries (the concentration input boxes show up after a heatmap entry is selected). We’re looking into and will try to roll out a fix asap.
The issue with the input fields for the concentration values in the pourbaix app not showing up is fixed. Thank you for your patience!