If a doc lives in a workspace that is on a Free Coda plan, it may encounter limits on how many objects it can contain. Objects include pages, tables and views, controls, and formulas. For more on doc size and how it's calculated, please see this article.
If you are approaching the limit for number of objects in your doc, there are a few organizational tips and tricks you can use to decrease the number of objects in your doc without changing its contents or utility.
Use collapsible content to consolidate pages
Now that you can collapse and expand text, tables, views and lists within a page, you can create a cleaner looking page that contains a lot more information.
For example, if you have a separate page for each meeting and its notes, consider having just one page for all meeting notes, and a heading for each meeting. If you collapse each heading, doc viewers can come to the meeting notes page, see the list of meeting notes available, and expand only the content they wish to review.
Or perhaps you have one top level page for drafted content, and a separate one with final drafts nested underneath it. Consider moving the earlier draft(s) beneath the final draft on the same page, and collapsing it under a header.
You can see more on collapsible content here.
Take advantage of the editable space on top-level pages
With pages that nest within each other, the top level page (previously the folder) is an editable object within your doc. If you previously had the first page within a set of pages solely serving as a project overview or a directory of resources or teammates, consider moving that overview content to the top level page's editable area to free up a page.
Consider opportunities to nest pages within each other
When you nest pages with several levels of hierarchy, it's a good time to think about your overall doc structure. For example, if you previously had a folder that was a catch-all of supporting details for other pages, consider nesting those supporting pages under the content they're meant to support. A little bit of re-organizing can remove the need for a page that was previously a folder (or two, or three . . .) of appendix material.
Delete unnecessary objects
Finally, if you've got empty folders, tables that no longer spark joy, or pages are older versions of new-and-improved pages with more current data, consider deleting these older objects. Remember: views, controls and buttons can be deleted to free up space as well.