If the project has a large number of environments, even the filtered list of attributes when often requires a scroll to find the right attribute from the right environment. (2.png)

As there is no way to limit the environments in the connect project, having a mechanism to collapse ( and disable) attributes in the collapsed environment would help simplify the selection process. Expanding the "+" (1.png) next to the environment, enables the attributes for filtering. Clicking it collapses the attributes in the environment, disabling them.