Query parameters help you to filter and request specific data from an API endpoint.
You can add query parameters in two ways:
  1. Add them in the URL.
  2. Add them in the parameters tab.

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Adding parameters in the URL

To add a parameter in the URL, append ? at the end of the URL and add a parameter in key=value format. You can add multiple parameters by separating them using &. For example, the below URL is filtered to get the data of the first three Pokemon. 
https://pokeapi.co/api/v2/pokemon/?offset=6&limit=3
For which you will get a similar response: 
{
  "count": 1281,
  "next": "https://pokeapi.co/api/v2/pokemon?offset=9&limit=3",
  "previous": "https://pokeapi.co/api/v2/pokemon?offset=3&limit=3",
  "results": [
    {
      "name": "squirtle",
      "url": "https://pokeapi.co/api/v2/pokemon/7/"
    },
    {
      "name": "wartortle",
      "url": "https://pokeapi.co/api/v2/pokemon/8/"
    },
    {
      "name": "blastoise",
      "url": "https://pokeapi.co/api/v2/pokemon/9/"
    }
  ]
}

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Using the parameters tab

You can use the Parameters tab to set key-value pairs for your API requests. This tab also lets you add a description for each parameter, helping you provide a clear explanation of what each parameter does and why it’s important. Postdata also offers a Bulk edit feature, allowing you to add or modify multiple request parameters at once, with each key-value pair on a new line separated by a colon (:). For example, 
param1: value1
param2: value2
# param3: value3
Try using the parameters tab to see if you get the same response as adding parameters in the URL.