TOC titles are formatted according to Contents Heading paragraph style.
If you want a systematic page break before a TOC, modify Contents Heading style in Text Flow
tab. There you can insert a page break before and even choose the page style if your TOCs are laid out differently than the body of the document (e.g. a different header or page numbering).
If you only need more vertical spacing before your TOC, see @anon87010807’s answer.
EDIT 2021-03-29
Page break before the first “H1a” paragraph is added with direct formatting. This is one of the rare cases where this is legitimate.
- Put the cursor inside the heading.
-
Format
>Paragraph
and go to Text Flow
tab
- Change the Breaks property to add a page break before.
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