Hi Atosam,
Sorry for the delay in response.
When you use the Fill & Sign option, it will open one page at a time in the window.
However, you can scroll the page to next one using the navigation bar that shows at the bottom of the window.
If it does not appear by default there, move the cursor at the bottom of the page.
There you will find the up and down arrow keys to move from current page to previous and next page.
See the screenshot below of the navigation bar that appears on hovering the cursor at the bottom:

Check if that helps.
Let us know how it goes.
Regards,
Meenakshi