How can I remove the large tool-field?

Yes, you can close the Tools Tray, but then the document takes the whole screen...  How can you make the page smaller so you can see and click to switch to other windows behind it for other applications?  Filling out a  form, I need data from another file, but can't get Adobe out of the way!  So rude, the new Adobe won't give any portion of the screen, closing the aggravating boxes on the side just then makes the document a screen hog, even when clicking any of the sizing buttons!  What happened to sizing the window??  The "Help" files have nothing on such simple stuff, as always.  Please help!  I promise I'll never upgrade again!