Are filter categories in the search customizable?

Are search filter categories such as accommodation type, accommodation services or unit and room amenities customizable?

First Check: 

a) Is your account synchronized with property management systems Hostaway, Hostfully or vOffice?

If yes, please check if "overwrite content with each synchronization" is enabled.
If this is enabled all properties' contents including descriptions, amenities, images and other text contents will be overwritten with every import.

-> Filter categories are not customizable as the full synchronization with your property management system includes categories such as accommodation types and services.

If no, you are able to set and customize categories within the opentravel.org data standards.

Example: Management Console -> Inventory of Accommodations -> Categories (Storefront Filter Category: "Accommodation Type")