Tell us what you are trying to do?
To disable the post title in the detail page for custom post type
Is there any documentation that you are following?
https://codex.wordpress.org/Post_Type_Templates
I tried to edit the "single-bildungsangebote.php" at my Child theme as Bildungsangebote is my Custom Post Type, but that don't seem to work. But it does with "single.php"
Is there a similar example that we can see?
What is the link to your site?
And again "the problem is always in front of the screen" 😉
The slug was "bildungsangebot" (singular) and not "bildungsangebote" (plural). As the CPT is mentioned in plural at the Toolset Dashboard, I overlooked the spelling of the slug. After renaming the template to ""single-bildungsangebot.php", everything ran fine.