Blog post header, search on enter, reverse date format

Hello.
I already asked about some problems and I didn’t get any help from you. There are three problems with this theme:
1. The header is not hidden in the blog post. But hide is enabled in the settings.
2. Search does not work when pressing the enter button on the page of all tournaments.
3. On the page of all tournaments, the date format does not change from Y-m-d to d-m-Y