Ranged left (also called flush left or align left) is a type of text alignment in which the left edge of the text is even with the left margin, and the right edge of the text is ragged. Ranged right (also called flush right or align right) is a type of text alignment in which the right edge of the text is even with the right margin, and the left edge of the text is ragged.
Publishers use ranged left/right to create a more visually appealing and easily readable page. Justified text can be difficult to read because the uneven word and letter spacing can create “rivers” of white space running down the page. Ranged text avoids this problem by aligning the text on both the left and right margins.
RL or RR text can be created using most word processing programs, though some professional typesetting programs may offer more control over margins and other aspects of the layout. When creating RL or RR text, it is important to keep in mind that the text should still be balanced across the page; too much text on one side can make the page look lopsided and difficult to read.
While RL and RR text may be more visually appealing than fully justified text, it is important to keep in mind that this style can be more difficult to typeset correctly. In particular, it can be difficult to ensure that the margins are even across the page, and that the text is properly aligned on the spine of the book. For this reason, many publishers will only use this style for certain types of books, or will leave the decision up to the typesetter.
Ranged Left/Right is important for books and publishing because it allows for a more efficient workflow when creating books. This system ensures that all of the pages in a book are in the correct order before they are sent to the printer. This eliminates the need for manual sorting and re-sorting of pages, which can save a lot of time and money.