Quip Spreadsheets can either be embedded in a document or you can create a "full screen" spreadsheet (like a traditional spreadsheet in excel or Google Sheets). If you are viewing a spreadsheet in a document and would like to be able to see more of the data (rather than scrolling), you can click the button in the top left corner that looks like this:
That will only change the view for you -- everyone else will still see the spreadsheet inside the document. If you'd like everyone to see the full screen spreadsheet, you can head over to the gear menu in the top right corner of the document, and choose "spreadsheet" from the "Themes" menu.
This will make the spreadsheet full screen for everyone and if there are multiple spreadsheets in the same document, they will become tabs.
For more info, head over here.