RVIZ - Click the "Add" button below the Displays section

Course Support ROS Basics In 5 Days (Python)
1

In the course
ROS IN 5 DAYS Chapter 1: ROS Deconstruction
when it comes to RVIZ — cannot find “Add” button below the Displays section - there is no add button below Display section.
Now I am googling this maybe will get help…

OK, Solved - just have to click several times in RVIZ-Chrome window - it rearranges by itself and show finally Add button - which never appear at the beginning.

2

Also you have a rearange button on the top right corner of the graphical tools.