the double arrow is always visible prior to going into full page.
If you want to enlarge the page manually, without going into full page, just grab hold of any corner of the window and the double arrow will appear and you can click and drag the window to whatever size you want.
Is there any way that one can regulate the size of "FULL PAGE"? Instead of hunting for the little double arrow that is unseen in full page, is there some way to have it always showing? Thanks.