The Property inspector is not showing anything? I want to change the type/colour of the blue curve. How to solve the issue?

The Property inspector is not showing anything? I want to change the type/colour of the blue curve. How to solve the issue?

[DGM]

Does it do this for all objects, or just this one? What version is this? Is there a reason you can't use the object's handle to directly set the properties programmatically?

[Atom]

All objects...Matlab 2020 a Version. I got this plot with MATCONT, so I can not chage its colour programmatically. Is there any other way?

[DGM]

See if you can find a line object in the current axes

hl = findobj(gca,'type','line')

If there are multiple axes, you might have to find the appropriate axes handle first.