Is there a suggested way to use the OpenROAD GUI to view routing congestion when using the OpenLane flow? I found the undocumented

flow.tcl -gui

which appears to do what I want but the GUI immediately closes and it appears to start a new run first. I want to few the congestion of a previous failed run. I suspect I need to manually position some macros.

You can run

openroad -gui

inside the docker

The solution I found was to run

./flow.tcl -design ucaspian -tag floorplan -to floorplan -overwrite

then

./flow.tcl -design ucaspian -tag floorplan -gui