pages adding as part of the spread

Hi @hendy_5450 , Without a sample file we are only guessing, but check your Type>Smart Text Reflow preference:

Then if you are flowing text into a Primary Text flow make sure you select all of your pages in the Pages panel and have Allow Document Pages and Allow Selected Spread to Shuffle checked. If they are unchecked you’ll get this:

If they are checked then pages are added as needed:

Typically this would happen if you've turned off Page Shuffling.

Some screen captures, at the very least, if not the file, would help.