just for fun, I tried
.x $ROOTSYS/tutorials/tree/parallelcoord.C (in 5.17.02)
(It’s very nice!) In the Canvas Editor, when I go to the “Variables” tab and then push “Delete”, I would expect the axis with “x” to go quietly away (since that’s the selected variable by default). What happens is very different: the x and y axes move together and distort the plot. When I then try to drag and move the x axis to a position right of the y axis, ROOT crashes like this:
root  .x $ROOTSYS/tutorials/tree/parallelcoord.C
root  *** glibc detected *** free(): invalid next size (fast): 0x0000000000fa2f70 ***
This is very reproducible, at least on my machine.
Is there something wrong with the tutorial, or am I using it in the wrong way?