On many cards I have slider about name of section.
What is this slider for?
How can I delete it?
There’s an option in the entities card that is labelled (in English anyway) SHOW HEADER TOGGLE. That option is on by default, and if you have more than more toggle entry in a list of entities, that header toggle lets you turn all the toggle entities on or off in one place. If you change SHOW HEADER TOGGLE to off, then the toggle will not be shown in the header.
Thanks!
Tom