Folders Should Have a Their Own Page
Like some other note-taking applications like Notion and RightNote, I think Nimbus Note should offer the ability for each folder to have its own page. This helps with organization, and it also gives each folder the ability to be used as a type of cover page where it can have information for information for the other pages in that folder, or as a table-of-contents page with links to the notes in that folder.
An example how this could be useful for organization is taking notes on a chapter in a textbook. The folder could be used to hold specific pages with information or sections about the chapter, and the folder's page could be used to introduce the information about the chapter, outline the chapter with links to the different pages within the folder, etc.
I've attached a video of how I used RightNote to take notes about Computer Security. In the video, the folder is named "Introduction to Computer Security." This folder has its own page where the primary information goes, but within the folder is information about the CIA Triad, which is linked to in the folder's page.