Filipr

I had the same warning on PHP 8.2. I guess line 326 is telling the truth (“this is a real monkey patching”) 🙂

I added some additional checks to line 327, seems to work for me though I didn’t test extensively yet:
$message_list = ( is_array( $additional_settings ) && isset( $additional_settings['message'] ) ) ? sanitize_text_field( implode( ' ', explode( '] [', $additional_settings['message'] ) ) ) : '';

You mean it jumps to the left, I think. I don’t want that either, I just wanted the default template on all pages and not the list of child pages.

What worked for me: comment out or delete this section in style.css:

/* =Layouts
----------------------------------------------- */
.layout-sidebar-left .site-main {
  margin: 0 0 0 30%;
}

.layout-sidebar-left #secondary {
  float: left;
}

.layout-sidebar-left .content-area {
  float: right;
  margin: 0 0 0 -25%;
}