The main problem is shown here [https://youtu.be/qTaIs5CYQ0k](https://youtu.be/qTaIs5CYQ0k) but on Russian
I try to create manually new track between contacts each already has a connection (thin blue line - TBL)
But it's not possible
Also, I can create a new track from contact without TBL
Chrome
79.0.3945.88
OS X
10_14_6
EasyEDA
6.3.22