SQL Developer

I use SQL Developer quite a lot, but I need some basic help

I'm using SQL Develeoper 3.0.04

Question 1.
If I ever close [X] the Script Output tab/window, I have a huge headache trying to open/unhide it again. I can't do it!

I've looked in the menus,
Preferences / Keyboard shortcuts etc but I just can't see it.

So how to a make the Script Output tab re-appear? THere must be a toggle somewhere.

Question 2.
In a previous version of SQL developer, I used SET SERVEROUTPUT ON.
The output from all my dbms_output.print_line statements would appear in the script output window FOR THE ENTIRE SESSION.

In this version that I'm using, everytime I run an anon block I have to preceed the block with SET SERVEROUTPUT ON.
It doesn't remain ON for the entire session. It only affects the next block of code that I try to execute.

An I doing something wrong?

Thanks for any help.
Stu