LibreOffice Writer Outliner

 Heading 2 style is flagged “keep with next paragraph” so that the heading will never print last on a page with its text starting on the next. This flag is cumulative, i.e. whenever several consecutive paragraphs are so flagged, they form an indivisible block. This is what you get with your sequence of Heading 2 paragraphs. Their number is such that they don’t fit in the remaining page space under their Heading 1 paragraph. The Text Body paragraph following chapter 5 heading was kept with Heading 1 (because Heading 1 is also flagged “keep with next paragraph”) but introduced a “natural” break location for formatting.

You have nothing to do to “fix” the problem. As soon as you write a Text Body between the Heading 2, you make smaller independent blocks and they will flow to their expected location.

https://ask.libreoffice.org/t/unwanted-auto-page-break-after-headline/31081/2

LibreOffice Writer - Outline Folding Mode

 Outline folding mode

Added a new Writer outline folding mode (as experimental feature). You should enable experimental features in Tools ▸ Options ▸ LibreOffice ▸ Advanced dialog to see "Show outline content visibility button" checkbox in Tools ▸ Options ▸ LibreOffice Writer ▸ View dialog. After checking it you'll can see a button with arrow near any selected heading in your document. Click on it to fold all text from the current heading to next heading. Right click on it to fold all text from current heading to next the same level heading with all its subheadings

Outliner for LibreOffice

Organon is a plugin for LibreOffice and OpenOffice.
Organon allows to split up large texts into parts, allows tagging and opening parts of the project in new tabs.

• Parts are shown in a treeview. Entries can be moved by drag and drop.
• Every entry can be tagged.
• Tags are freely configurable, can be renamed, created and deleted. Organon's Organizer is a fast way of showing and editing all tags at once.
• Tabs can be opened based on these tags. They also might freely be chosen from the folders and files of the project and they might be sorted by date and/or time.

Organon offers extensive import and export options.


https://organon4office.wordpress.com/

LibreOffice Impress export as images

http://extensions.libreoffice.org/extension-center/export-as-images