catkin ws extends from /opt/ros issue

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Hi everyone,

I am having issue regarding the 'extend' parameter when I want to run at the same time executables from /opt/ros/melodic and from my personal catkin_ws folder. In my case, I am running:

rosrun rqt_multiplot rqt_multiplot

Which has been install from the apt:

sudo apt install ros-melodic-rqt-multiplot

So it is located in /opt/ros/melodic/lib. So to be able to run it I source the /opt/ros/melodic/setup.bash

But then, when I configure the graph to display a topic from a node located in my personal catkin_ws folder (my pkg name is 'open_vino_pkg', I have the the error:

[rospack] Error: package 'open_vino_pkg' not found

And indeed, when I do rospack depend open_vino_pkg it does not find it.

So then I source my personal folder source catkin_ws/install/setup.bashand then it is able to find my pkg, but not anymore the executable of rqt_multiplot:

rosrun rqt_multiplot rqt_multiplot gives me the error: [rosrun] Couldn't find executable named rqt_multiplot below /home/antoine/catkin_ws/install/share/rqt_multiplot

My personal catkin_ws has the extend parameter to /opt/ros/melodic (I use catkin tools). So, I do not understand, how to be able to use executables located in those two different locations, knowing that the 'source' overwrites the path, even with 'extend'.

What did I not get?

Thanks!