@Raptorofwar I think the tech tree is supposed so simulate evolution in the ant species and as such, once a tech is evolved in the species it cannot be undone and changed. Which is why I think they don't have a way to switch tech upgrades once your ants have evolved.
I've found a temporary work around, if I bring up the menu it shows the level of the tiles around it, annoying, but it helps figure how the tile levels and upgrades are looking.
So when I try to upgrade tiles I can't see the current level of tiles. The tile levels randomly flash on my screen during play and are there for about a frame then disappear. There is no way to keep them on the screen, especially when trying to upgrade so I have to mouse over and see if them...