Filter to include odata parameters into Swagger UI (checked on AspNetCore 6.0). This is a modification of @jacobmohl code from https://gist.github.com/jacobmohl/a7eb2f3b508b61a2bd04ef0fe6d6e1de

ODataOperationFilter.cs

using Microsoft.AspNetCore.Mvc.Controllers;
using Microsoft.AspNetCore.OData.Query;
using Microsoft.OpenApi.Models;
using Swashbuckle.AspNetCore.SwaggerGen;

public class ODataOperationFilter : IOperationFilter
{
    public void Apply(OpenApiOperation operation, OperationFilterContext context)
    {
        if (operation.Parameters == null) operation.Parameters = new List<OpenApiParameter>();

        var descriptor = context.ApiDescription.ActionDescriptor as ControllerActionDescriptor;
        var queryAttr = descriptor?.FilterDescriptors
            .Where(fd => fd.Filter is EnableQueryAttribute)
            .Select(fd => fd.Filter as EnableQueryAttribute)
            .FirstOrDefault();

        if (queryAttr == null)
            return;

        if (queryAttr.AllowedQueryOptions.HasFlag(AllowedQueryOptions.Select))
            operation.Parameters.Add(new OpenApiParameter()
            {
                Name = "$select",
                In = ParameterLocation.Query,
                Schema = new OpenApiSchema
                {
                    Type = "string",
                },
                Required = false
            });

        if (queryAttr.AllowedQueryOptions.HasFlag(AllowedQueryOptions.Expand))
            operation.Parameters.Add(new OpenApiParameter()
            {
                Name = "$expand",
                In = ParameterLocation.Query,
                Schema = new OpenApiSchema
                {
                    Type = "string",
                },
                Required = false
            });


        if (queryAttr.AllowedQueryOptions.HasFlag(AllowedQueryOptions.Filter))
            operation.Parameters.Add(new OpenApiParameter()
            {
                Name = "$filter",
                In = ParameterLocation.Query,
                Schema = new OpenApiSchema
                {
                    Type = "string",
                },
                Required = false
            });


        if (queryAttr.AllowedQueryOptions.HasFlag(AllowedQueryOptions.Top))
            operation.Parameters.Add(new OpenApiParameter()
            {
                Name = "$top",
                In = ParameterLocation.Query,
                Schema = new OpenApiSchema
                {
                    Type = "string",
                },
                Required = false
            });

        if (queryAttr.AllowedQueryOptions.HasFlag(AllowedQueryOptions.Skip))
            operation.Parameters.Add(new OpenApiParameter()
            {
                Name = "$skip",
                In = ParameterLocation.Query,
                Schema = new OpenApiSchema
                {
                    Type = "string",
                },
                Required = false
            });


        if (queryAttr.AllowedQueryOptions.HasFlag(AllowedQueryOptions.OrderBy))
            operation.Parameters.Add(new OpenApiParameter()
            {
                Name = "$orderby",
                In = ParameterLocation.Query,
                Schema = new OpenApiSchema
                {
                    Type = "string",
                },
                Required = false
            });
    }
}

How do I need to setup OData, so that queryAttr contains the correct configuration?
Currently queryAttr says that Expand is activated, but I've never activated it. In fact I've explicitly disabled it the validateQuery method.