How to remove parent's image size from child theme?

In which file are those functions being set?

In the functions.php

And where are they being called?

line 33-37 of the parent’s function.php outside a function, no hooks

if ( function_exists( 'add_image_size' ) ) {
	add_image_size( 'full-size',  9999, 9999, false );
	add_image_size( 'nivo-slider',  980, 400, true );
	add_image_size( 'post-image',  660, 220, true );
	add_image_size( 'portfolio-thumb',  290, 190, true );
	add_image_size( 'portfolio-single',  500, 9999, false );

This resource should help https://codex.www.ads-software.com/Child_Themes#Using_functions.php

Didn’t help, in my case.

The codes are placed outside a function.

Which theme is that?

The parent theme is Proyecto. I’ve put the download link below:

Proyecto by AJ Clarke from WPExplorer.com
[ Redacted, please do not post links to themes like that use the author’s link instead https://www.wpexplorer.com/proyecto-free-business-portfolio-wordpress-theme ]

I’m not sure that theme’s supported by these forums. Is it available through https://www.ads-software.com/extend/themes/ ?

No it doesn’t.

What should I do?

The theme’s vendors should provide support for these issues.

Thanks

Hey weeix, here’s one that worked for me:

https://www.studiograsshopper.ch/code-snippets/remove-wordpress-defaultmedia-image-sizes/

Thanks wahmaholic, it worked out perfectly!