@RAYNOORDEN, Are the pages custom-made pages or pages built with the site editor? If the pages are custom templates within the theme itself then it is not possible. Also, is it possible to share a site URL and links of subpages so that we can check let you know it its possible or not

You can simply add ‘.entry-meta’ on the above code like below
.entry-meta,
.single-post .single-post-meta{
display: none;
}

Let us know if this works

@SOARTS, Is it on the single post? As you can see in the screenshot with the red mark area
https://www.awesomescreenshot.com/image/47247115?key=41686c024304b79114ba0a7d3b244951

You can add this CSS in the Additional CSS to hide the post date and author from single post

.single-post .single-post-meta{
display: none;
}

@CURRIOUSCAT, The issue with the slider, maybe it’s due to the conflict with some third-party plugins active on your site. To verify that you can add the “Health Check” plugin and active troubleshooting mode and disable all the plugins except for the recommended one and check if the issue still exists

Also, you can add this CSS on the Additional CSS under the customization section

.home #featured-slider #main-slider{
height: 865px !important;
}

Let us know if this code works

@DREWVY, Please add this CSS to Additional CSS under customization section

@media only screen and (min-width: 768px) {
.wp-block-jetpack-slideshow .wp-block-jetpack-slideshow_caption.gallery-caption {
bottom: 40px !important;
}
}

.wp-block-jetpack-slideshow .wp-block-jetpack-slideshow_pagination.swiper-pagination-custom{
justify-content: center !important;
}

@LABYRINTHGUY, thanks for the login. We have visited your dashboard and found that the current license is inactive so the theme is not able to update. Please replace the old license key with the new one and try to update the theme

@LABYRINTHGUY, Seems no need to update the license for Education Hub Pro. You can update the theme to v3.9.1

If in case WordPress alerts all customization will lost, please share with us the reference screenshot of that message. So that we do a further investigation