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If a line after the last line that features a hyphen has too large word spaces, you can adjust the hyphenation manually with soft hyphens (also called smart hyphens; you can use the menu entry insert > charachter > smart hyphen or its ctrl+shift+- shortcut), or by removing hyphenation locally. Select chars and run Extras->Dehyphenate.
Also, If you want to squeeze some text, select it and set horizontal scale to 94-98%.
With 1.3.4 you can create manual line breaks, so that if the word starts with a soft hyphen, it does not hyphenate.
Further reading about Hyphenation in combination with Full/Forced Justification