That's what I do on each and every one of my web pages and it works great.
Don't worry it is quite simple to remedy and you can do it yourself if you want to, here's how -
1. When adding a page in site central, put the following html code at the beginning of the first text block:
1 2 3
This effectively closes the table that SBI uses to put your text into - the one that leaves all that extra space on the right of the screen.
2. Next you need to 'open' your own table to put your text into. On the next line immediately after insert the following:
|This is where you start off your page text
You can set the "alignment, width, cell spacing and padding" of the table to whatever dimensions you want. As you can see I favor a centered table that is 92% of the screen size from the edge of the left graphic image to the right-hand side of the page.
3. Now you need to 'close' your table. When you have finished with your text add the following code on the next line: