Modify page title format (when using title-tag)

If you’re using the Yoast SEO plugin (which it looks like you are) then this answer might help you

If you are using yoast SEO plugin then the easiest method is to remove
the archive word from “titles & metas-> Taxonomies->category”

find:

%%term_title%% Archives %%page%% %%sep%% %%sitename%% replace it with:

%%term_title%% %%page%% %%sep%% %%sitename%%

Alternatively you could try changing it using the get_the_archive_title filter as explained here

add_filter( 'get_the_archive_title', function ($title) {

if ( is_category() ) {

        $title = single_cat_title( '', false );

    } elseif ( is_tag() ) {

        $title = single_tag_title( '', false );

    } elseif ( is_author() ) {

        $title="<span class="vcard">" . get_the_author() . '</span>' ;

    }

return $title;

});