I have a search engine created on my page with filters.
The problem comes because I have more than 70 categories and i want to insert a accordion between categories radial selectors.
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It wouldn't be too difficult where you have several filters to hide some of the filters (e.g. "advanced filters") within an accordion, but you are describing hiding just part of a single filter, which is rather different.
You would need a bespoke solution for this.
Essentially you would need to use JS (or jQuery) to modify the markup of the filter section, moving some of the checkbox inputs inside a div that you then controlled the visibility of using some button you add.
If you are not comfortable programming that yourself, you will need to ask a developer to do it for you, it's outside the scope of support to provide such custom solutions.