At the page you want to change from visible to not visible page numbering, use Insert - Break... - Section break types 'Next page'
Now go to a page in the first section of the document
Use View - Header and Footer
Using the Header and Footer toolbar:
Click the 'Switch between Header and Footer' icon
In the Footer click the 'Insert Page Number' icon
Move you cursor to the footer of the first page of the second section.
(It should be marked 'Footer -Section 2-' just above the footer, and it will have 'Same as Previous' also just above the footer.
From the Header and Footer toolbar click the 'Link to previous' icon
The text 'Same as Previous' will disappear.
Now delete the page number in the Section 2 footer.
Close the Header and Footer toolbar.
Pages in the first section will display a page number, but the remaining pages will not.
If posting again please use a title that reflects your issue.