Print preview scale is valid, well, only for print preview. It allows you to zoom in on details as a magnifying glass would then otherwise only reveal pixels.
There is also no scale in the print dialog because it does not make sense: your document has been laid out within the limit of the page print area. Zooming is effective on the whole page and the sheet area needed would overflow it.
The solution is to change your font size.
If your document is consistently styled, i.e. is not polluted by any direct formatting (I have particularly in mind the character level), change font size in Default Paragraph Style and it will cascade to all other paragraph styles.
However, styles are rarely related to each other with %-units. They are rather grouped in clusters below overriding styles. So, your best move is to reconfigure these styles in Writer so that your document is automatically reformatted.
- Open
Tools
>Options
(under MacOS, this is the Preferences
menu), LO Writer
>Basic Fonts (Western)
- The dialog allows to change default font face and size for:
-
Heading: all headings styled with Heading n, Title, …
-
List: bullet and numbered lists if the have been styled List xxx or Numbering yyy
-
Caption: figure, table, drawing, … captions
-
Index: TOC, alphabetical index, table of figures and other indexes
-
Default: everything else
There is a high probability you manually modified Body Text. So change also its font size so that your main topic will also scale.
PS:
This is not informative at all. And this statement will not meaning anything for a visitor next week or next month. Always mention OS name and exact level, LO release numeric id and save format.