I know of only two ways to increase the leading, or line-spacing, in a block of text (using, specifically, LO 4.3.7.2, Curtains 7/64 bit). One is to right-click, go to line-spacing, and select.
That indeed modifies line spacing for the current paragraph (as distinct from the current paragraph style). You can reach the same setting at Format | Paragraph... | Indents & Spacing | Line spacing (or right-click | Paragraph... | Indents & Spacing | Line spacing).
The other is to put an explicit <CR>, or <ENTER> at the end of one line to insert a blank line before the next.
That is quite another thing. Here you are not inserting a "blank line" (which is anyway an outdated, typewriter concept) but an empty *paragraph*. That generally won't achieve what you need, since text will not flow correctly between lines when it is modified.
There seems to be a third way lurking, as yet undetected. For a screenshot showing the unexpected behaviour, see: ... this link may be to the original .odt file: ...
There's no way to illustrate a verification of my statement that the context menu hasn't been invoked, but the dearth of excess <CR>s is proven by the revealed codes. Can anybody point out what I apparently haven't learned yet?
Yes: you are confusing line spacing (within a paragraph) and paragraph spacing (between paragraphs).
The last 3 lines of text above [in your document], and all subsequent lines, are apparently double-spaced, but as ^F10 will show, there are no extra line feeds there. Using context menu from right-click shows no setting to multi-line spacing either.
Those are not lines but paragraphs, and if you extend the text in any of the paragraphs until it flows to a second line you will see that the lines are not double-spaced. Instead, paragraph spacing (of 0.50 cm below) has been set for these paragraphs. See Format | Paragraph... | Indents & Spacing | Spacing | Below paragraph (or right-click | Paragraph... | Indents & Spacing | Spacing | Below paragraph).
Everything is "Default Style", no changes from section to section.
You could indeed have applied similar paragraph spacing using the (Default) paragraph style (e.g. through right-click | Edit Paragraph Style...), but here you have chosen to apply direct formatting instead - which takes precedence over style formatting.
Once the preceding paragraph was started, the multi-spacing went away.
Actually it didn't: that paragraph still has single line spacing but also the same paragraph spacing of 0.50 cm below - betrayed by the positions of the subsequent paragraphs in the document. (New paragraphs inherit the properties of the existing previous paragraph.)
I trust this helps.
Brian Barker