How to remove part of the url?

Question

URL Handling

There is a site https://yadecor.ru/
When I use the search, &post_type=post is added to the end of the request. Example
: https://yadecor.ru/?s=bas-relief&post_type=post
since without it, the search produces results, and with it it says that there are no records.
Since search results not only for post records should be. and throughout the site