Prevent iTerm2 from opening new terminal from dock

I just switched from TotalTerminal to iTerm2, and the feature I used the most was the visor. When I used my shortcut key (option + `), it'd drop a terminal from the top of the screen that i could tuck away with the visor shortcut again. Alternatively, if I clicked the terminal button in the dock, I could pull down the visor (or if I had other terminals open, I could go to those).

Is there a way I can have iTerm2 not open a new terminal when I click on it in the dock, but to just go to the most recent active terminal (which may be the visor)?

I'm running Mac OS Sierra (10.12.5).