Are you talking about the top of the blind ? Where it's held by those thin metal brackets ? I f so, we just replaced our blind, and had to pivot the upper right blind holder, I believe, by pulling it forward, releasing it from the upper left side holder, which doesn't pivot.
And then reversing the process to install the new blind. Not sure if this is what you were looking for, hope it helps. Later years apparently have a roller shade.
jim