WP-CLI

I have same question.

What would be the cli command to regenerate all thumbnails like in this photo config https://imgur.com/a/qAa4Lex

I only want to regenerate thumbnails for Featured Image Only

what would be the cli command?

Please check out the wp media regenerate CLI command – https://developer.www.ads-software.com/cli/commands/media/regenerate/

Note that this command is part of core WP CLI, and is not a part of this plugin. This plugin does not provide its own CLI commands.