So this is what I am doing. When editing the page I get the id and then used in the CSS code like this:

.postid-774 #page-site-header {
padding: 63px 0;
background-image: none !important;
}
.postid-774 header.page-header {
display: none;
}

I added it to the CSS section and published the change, nothing happens. I do still see the Page label and the Featured Image on the page.

.postid-121 #page-site-header {
padding: 63px 0;
background-image: none !important;
}
.postid-121 header.page-header {
display: none;
}
As you can see the postid here please change that postid with the id of the page that you want to make the changes

Go to Customizer >> Appearance >> Additional CSS, paste the above CSS there, and published the site.
let us know if you have any issues with it.

Regards,
Themepalace

Every page includes this image by default and its possible to disable the image but the space stays with the text. I want to disable only in a couple of them and avoid that empty space so visitors can get into the content immediately of my choose pages.

Is there any CSS code that I can add to the page of my choice and to disable image and text headers?

.menu-toggle {
	height: 90px;
}
.site-logo img {
    max-height: 60px;
}
.site-branding {
	padding: 15px 0;
	min-height: 80px;
}
.site-title {
	font-size: 26px;
}
.main-navigation a {
    border-bottom: 1px solid #eee;
}
.main-navigation ul.nav-menu > li {
	padding: 0;
}
.main-navigation ul.nav-menu > li > a {
	padding: 15px;
}
.main-navigation ul.sub-menu li a {
	padding-top: 15px;
	padding-bottom: 15px;
}
.main-navigation ul ul a {
    width: 100%;
}
.main-navigation ul#primary-menu li.current-menu-item > a,
.main-navigation ul#primary-menu li:hover > a,
.main-navigation ul#primary-menu li:focus > a,
.main-navigation ul.nav-menu > li > a {
	color: #2A3235;
}
.main-navigation ul ul,
.main-navigation ul ul ul {
    box-shadow: none;
    float: none;
    position: relative;
    top: 0;
    left: 0;
    margin-bottom: 0;
    display: none;
}
.main-navigation ul.sub-menu li {
    padding-right: 0;
}
.main-navigation .menu-item-has-children > a:before {
    content: "";
    float: right;
    position: relative;
    right: 25px;
    background-color: #ccc;
    width: 1px;
    height: 25px;
}
.main-navigation .menu-item-has-children > a:after {
    padding-top: 3px;
}
.main-navigation ul.nav-menu > li > a,
.main-navigation ul.sub-menu li a {
    padding: 15px 15px 15px 25px;
}
.main-navigation ul.sub-menu li a {
	padding-left: 50px;
}
.main-navigation ul.sub-menu ul li a {
	padding-left: 75px;
}
.main-navigation ul.sub-menu ul ul li a {
	padding-left: 100px;
}
.main-navigation ul.sub-menu ul ul ul li a {
	padding-left: 125px;
}
.main-navigation .menu-item-has-children a svg {
	display: none;
}
.main-navigation ul.sub-menu li a {
	border-left: none;
}
.main-navigation ul.nav-menu {
    margin-right: 0;
    background-color: #fff;
    margin-top: 25px;
}
.main-navigation {
	position: static;
}
.main-navigation a {
	color: #1C2B42;
}
.main-navigation svg.icon-search,
.main-navigation svg.icon-down {
	fill: #1C2B42;
    margin-top: -5px;
}
.main-navigation ul.sub-menu {
	border: none;
}
.menu-open .menu-toggle .icon-close {
	display: block;
	fill: #fff;
	margin: auto;
	width: 20px;
	height: 20px;
}
#masthead.site-header .main-navigation ul.nav-menu {
    margin-top: 0;
    position: absolute;
    max-width: 400px;
    top: 100%;
    left: auto;
    right: 0;
    width: 100%;
    border-top: 1px solid #eee;
}
.main-navigation .search-menu a {
    display: none;
}
.main-navigation form.search-form input {
    background-color: #fff;
    border: none;
    min-height: 55px;
}
.main-navigation form.search-form button.search-submit {
	height: 59px;
}
.menu-open #search {
    display: block !important;
}
.main-navigation form.search-form input {
	padding-left: 25px;
}
.main-navigation .sub-menu svg {
	-webkit-transform: rotate(0);
	-moz-transform: rotate(0);
	-ms-transform: rotate(0);
	-o-transform: rotate(0);
	transform: rotate(0);
}
#site-navigation ul ul {
	background-color: transparent;
}
.main-navigation li,
button.dropdown-toggle,
.menu-toggle {
    display: block;
}
.main-navigation ul.nav-menu > li:not(:last-child):after {
    display: none;
}
.main-navigation ul.nav-menu {
	display: none !important;
}
.menu-open.main-navigation ul.nav-menu {
	display: block !important;
}
.main-navigation ul.nav-menu > li:not(:last-child) {
    margin-right: 0;
}
.menu-sticky #masthead.nav-shrink .main-navigation ul.nav-menu > li > a {
	padding: 15px 15px 15px 25px;
}
.main-navigation ul ul {
    opacity: 1;
    visibility: visible;
}
.main-navigation ul.sub-menu li a {
    color: #000;
}
.main-navigation ul.nav-menu li.menu-item-has-children:hover ul.sub-menu li a {
    padding: 15px 15px 15px 50px;
}
.main-navigation ul.sub-menu > li:last-child > a {
    border-bottom: 1px solid #eee;
}
.main-navigation form.search-form {
    border: none;
}
#search:before {
    display: none;
}
#search {
    position: relative;
    top: 0;
}
#masthead .main-navigation a:hover,
#masthead .main-navigation ul.nav-menu > li > a:hover,
#masthead .main-navigation ul.nav-menu li.current-menu-item > a {
    color: #A90125;
}

Regards

Regarding you query, the featured is managed by the theme itself and you have to add more menu in order to make the logo in the middle of the header.

As shown in the screenshot below, menu with long text might also help you to adjust.

https://prnt.sc/vcbpg9

Hope this helps.

If you have queries further, let us know.

Regards.

Thank you for getting back to me!

My website url is: http://beeftro-lavka.ru

As you can see the logo (also name of the website when I choose option to show it) is not centred in the middle of the menu (between items 3 and 4), where it is supposed to be. I tried a few ways to manage it, but it still stays in the same position.

If there was a way to fix it, it would be great!

Thanks!

Regarding your query, actually the menu and logo is managed by the theme itself. You can change the location with the CSS however the design will be messed up after the changes.

However, please provide us with your site URL so that we can help you if possible.

Also, provide us with screenshot explaining and marking where the menu and logo should locate.

Regards.