Adding support to an active bridge is not possible

Hello and good prints.

Last Z-Suite 3.5 - M200 Plus.
I’ve this issue, when in support step I insert manually a support (any kind, on every overhang) I’ve this error message:
“Adding support to an active bridge is not possible”
And it adds (graphic) the support.

First of all, I don’t get what is an active bridge, it means smart bridge?
When I’m in Smart Bridge tab there’s no green or red surfaces showed, even if I activate ENABLE ALL.

So, in support edit mode the overhangs are showed in red, when in Smart Bridge mode there’s no overhangs pointed out.

Please explain what this “active bridge” means, thanks.