Naoko Takano

Html5 Video Player Plugin could work for you.
https://wordpress.org/plugins/html5-video-player/
With the Free version, you will need to upload video files to your media library.

1. Install and activate
2. Add a block called “HTML5 Video Player”
3. Update the “Settings” and “Controls”

Screenshot of “Controls” section: https://cloudup.com/cUo5Ux1TKTE

It will add a gradient overlay on your video (for the control to be always visible). You probably don’t need that – you can hide it by adding this to the Additional CSS (Appearance → Customize → Additional CSS):

.h5vp_player .plyr--video .plyr__controls {
    background-image: none;
}

If you are not familiar with CSS editing, you can refer to this doc https://wordpress.com/support/editing-css/ (this is about WordPress.com but should look very similar on your site)

• This reply was modified 4 years, 1 month ago by Naoko Takano.

@proxxim

You may be looking for an example like this?
https://themes.trac.wordpress.org/browser/quadrat/1.1.2/theme.json#L324

I think you’ll find good sample code looking through these themes’ theme.json files.
https://wordpress.org/themes/tags/full-site-editing/

(also, this post: https://wordpress.org/news/2021/07/configuring-theme-design-with-theme-json/)

• This reply was modified 4 years, 11 months ago by Naoko Takano.

As long as you follow the instructions carefully, I personally don’t think creating a Child Theme for this purpose is super hard. It may take some time because it’s the first time but could be good practice for learning how things work.

If you want to move on with the direction, I recommend setting up a separate test site so that you won’t break the live site you have.

From 12:46 of this video, you can learn about tools to set up a local site (WordPress site running on your computer) for that purpose.
https://learn.wordpress.org/workshop/introduction-to-wordpress/

I was going to test with the theme but it looks like you are using a premium theme. You may want to contact theme support and check if this is a known issue.

Which theme are you using?
Are you also using WooCommerce or any other plugins?

It looks like the Related Posts section is coded into inc/single.php file of the theme (line 60) and there isn’t an option to remove it.

If you really want to remove it, you can create a Child Theme on your own and edit out the part you don’t need.
https://developer.wordpress.org/themes/advanced-topics/child-themes/#adding-template-files

Or, you may want to talk to the author on the theme forum and suggest adding an option to turn it off:
https://wordpress.org/support/theme/writers-blogily/

How about adding something like this to the Custom CSS?
(you may need to tweak the color of the a element more)

.blocks-gallery-grid .blocks-gallery-image figcaption {
    color: #000;
    background: none;
}
.blocks-gallery-grid .blocks-gallery-image img {
    padding-bottom: 40px
}