I know Query parameters appear after a question mark in the endpoint. But not all of them are String. I can give you a screenshot of the JSON files from which I imported the collection into Postman and the data types of parameters could be string, integer, boolean, etc.
Even for Query parameters, it shows the data type that is declared in the JSON file. I found my mistake, the default was declared as blank in the JSON file, that’s why it was displaying blank in query parameters.