1. You can try to change this file jkreativ-themes/template/template-blog-masonry.php (same file on above) and jump into line 9. It seems you will need to change the orderby and order. In this case, on the orderby you can try to use date, date_add or date_create and on the order you can try to use ASC or DESC. You also can make some change on the line 97. Actually on the line 9 it will affect on the post filter and on the line 97 will affect when your post loaded.
2. You can deactivate WooCommerce plugin to turn off the woocommerce menus.
3. You will need to edit this file jkreativ-themes/admin/metabox/page/blogcontent.php and jump into line 115. You can adjust the value of max to fit with your own need.