Why can't add spaces at the beginning of the line?

[luofeiyu]

I want to add 4 spaces at the beginning of the second line.

sample.odt (12.3 KB)

When move the cursor at the beginning of the second line,press space bar,no spaces inserted,why?

[Wanderer]

@luofeiyu

When move the cursor at the beginning of the second line,press space bar,no spaces inserted,why?

Look at your own picture: They moved to the end of the previous line, because there was free room left.
.
So you can “close” the previous line with a line break as @elmau already told, fill more spaces (not recommended) until the line is full or use a completely different approach and edit the used paragraph style: Look for indent and realize also negative values are possible.

[elmau]

You need insert a line break at the end of first line.