change all endnotes

edit

There are three aspects in your question:

Changing endnotes to footnotes

In Writer endnotes and footnotes are different objects and are managed separately. This means you can have both footnotes and endnotes in the same document.

You must change change the category of every note (or those you want to switch) to convert from one category to the other.

The only procedure I know of is to double-click on the footnote number at the bottom of the page. A dialog opens and you can click on a radio button for Footnote or Endnote.

Changing "easily"

Well not exactly. As described above, you must click on the first note. The dialog shows two heavy arrows for navigating to previous/next note. But the process remains manual. Once again, the reason is to allow you to select which notes are fott- and which are end- individually.

Formatting notes

This is the easy and powerful part. Writer is based on styles, a collection of formatting rules to be applied to paragraphs, runs of characters, frames, pages, … Styles are used to mark up document objects.

When you insert a note, the note content (in the bottom of the page is automatically styled (=marked up) as Endnote or Footnote depending in the category of the note. All you have to do to change the formatting of all notes at once is to customise the Endnote or Footnote paragraph style.

CAUTION! Changing the note category with the procedure above does not change the style. When you change the category, you must also restyle the note with the style drop-down menu to remain consistent.

Styles are the basis for the workflow in Writer. If you are not familiar with them, read the Writer Guide for an introduction.

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For changing the formatting of the endnotes, with left mouse button, you can choose an option Footnotes and Endnotes to change the formatting. I don't know though if there is a easy way to change all endnotes to footnotes, but I guess there should be something.