As soon as the general appearance of a page differs from others, you need to apply a specific page style. A page style is active for a sequence of pages between “boundaries”. I “boundary” is created by a special form of page break Insert
>More Breaks
>Manual Breaks
where you can specify the page style to activate after the break.
However, in the case of a cover page, a simpler procedure is available, thanks to a careful configuration of built-in page style First Page.
Apply First Page to the first page of your document. After the last element" of your cover, insert a standard page break. First Page automatically requests that subsequent pages are Default Page Style. Modify bot page styles according to your needs (header/footer, page numbering, margins, …).
In case you want to start numbering your pages from 1 after the cover, you still need a “special” page break described above to be able to force the starting number.
ps: when asking here, always mention OS name, exact LO version and save format.