I finally solved the sidebar problem mentioned in this topic:
https://support.themosaurus.com/forums/topic/sidebar-issue-on-sigle-post/

After trying many famous adv manager plugins like Advanced Ads – Ad Manager & AdSense, Ads & AdSense Plugin – WP QUADS, i found out that the problem was caused by the adsense code when i tried to insert it manually.

actually i solved this issue with this fragment, i hope it can help others in my same situation, but i am not very good with codes if you have a better solution to help i’ll glad

body.single.single-post.grimlock--custom_header-displayed .site-content {
    padding-top: 0 !important;
    margin-top: 0 !important;
    position: relative;
    z-index: 10;
    max-width: 1200px !important;
    margin: auto;
}

@media (min-width: 992px){
body.single.single-post.grimlock--custom_header-displayed #primary {
    max-width: 70% !important;
	}}

@media (min-width: 992px){
.site-content.region--9-3-cols-left > .region__container > .region__row > .region__col--3{
	flex: 0 0 30%;
    max-width: 30%;
}}

i have disabled this snippet now for let you see what happen on this example post:

Come inserire gli emoji dal pc con windows su un sito web