For several different pages -- search results, surnames, locations, politicians, military officers, historical events, other occupations, pedigrees, descendant charts, and others, you can select the fields you want to see. Go up to the button at the top of the page.
On the left under "Selected" are the fields selected to show, on the right are other fields available, but not shown. For any of these pages other than the pedigree chart, the fields will show in columns in the order listed here. To select, de-select, or re-order, click and drag, up or down, or left or right.
After making changes, the page will refresh with your changes shown. (If not, try it a second time.)
Each page should remember your choices, using browser cookies.