Click "edit" → "replace" in the menu bar, enter ^l in "Find Content", "Replace with" inside do not enter any character, then point "Replace all", can delete the soft return of entire document inside.
The above method just put all the soft return to delete, but the necessary paragraph line is still needed, so the following introduction to replace the soft return to a hard return. Click "edit" → "replace" in the menu bar, enter ^l in "Find Content", "Replace with" Enter ^p, then click "Replace All" on OK (Figure 1).
Actually know the soft return is ^l, hard return is ^p, then we can flexibly use. For example, we often encounter a document to be printed very long, there are many carriage returns in the middle, if you encounter segments and segments between two return, we can be replaced with a carriage return. This saves a lot of space.