If you launch the the xfce4-terminal from a script - it is normal the window closes when script is finished.
If you want the window to stay open instead of closing you use –hold.
I think what you are looking for is something like nohup
man nohup
Credit Mount get's undone when script ends? - #2 by Aragorn
On a sidenote - please don’t be lazy - posting screenshots of text - you can copy and paste the text into your comment - but a screenshot ?