For example, add a video track. But then only one audio track turns red. The entire timeline turns red.
It was not a truck lock. And all the added tracks will be red. Adding an av track also turns both video and audio red.
This can be an intense eye attack due to the contrast gap with the surroundings,
Above all, the problem is that I can not find how to unlock this or help. How can I prevent this red phenomenon from occurring?

what version of Kdenlive are you using? do you have a screenshot of the red track?

oh, sorry, i use kdenlive version is 19.12.1. thanks reply.

this. that is track all fill red. and status bar fill red. what this is?

i use kubuntu. info.
Operating System: Kubuntu 19.04
KDE Plasma Version: 5.16.5
KDE Frameworks Version: 5.62.0
Qt Version: 5.12.2