contemporary windows

[pianta]

Good morning.
in my installation it is not possible to open more than 15 xtop windows simultaneously, is a set number somewhere or are 15 and 15 will remain?
I use proe 4 but I noticed also in 2, 3 and 5

Thank you.

 

[Prof.]

15 and 15 will stay.
Bye.

 

[pianta]

I was almost sure
Thank you.