@KhaledFC12 said:
load different results
so maximum result per page is 20 result ok but every time its the same 20 result
how to change it every time user scroll the app to load the next 20 result (21,40)

The number/quantity of Items per Page and the number/quantity of Pages
cannot be changed, configured, specified, restricted, or anything like that.
There will always be up to 20 items per page.
And a maximum of 500 pages.
Therefore, at most 10,000 items.

Of course, depending on the parameters used in your API Request
this number/quantity can be much smaller.
Eventually zero.

In a Trending API Request, the quantities are greater.
A maximum of 1,000 pages
Therefore a maximum of 20,000 items

What you can do is just specify the page number you want.

https://api.themoviedb.org/3/trending/all/day?api_key=THE_KEY&page=1
https://api.themoviedb.org/3/trending/all/day?api_key=THE_KEY&page=2
https://api.themoviedb.org/3/trending/all/day?api_key=THE_KEY&page=3
...
https://api.themoviedb.org/3/trending/all/day?api_key=THE_KEY&page=494
https://api.themoviedb.org/3/trending/all/day?api_key=THE_KEY&page=495
...
https://api.themoviedb.org/3/trending/all/day?api_key=THE_KEY&page=996
https://api.themoviedb.org/3/trending/all/day?api_key=THE_KEY&page=997

That is, make an API Request for each page.

Thank you i now understand