If there are pages of the Member, Group, or Activity record you never use, or pages that you use more than others, you can control which pages appear on the window when you open a record by clicking the narrow down-arrow on the far right of the command bar when a record is open.
The following example shows this option on a Member record.
This window enables you to change the name of a page, move it up/down in the page order, or hide it entirely. Click Reset to restore the original settings.