For easy editing and code inspection, the appearance of code in the editor can be customized. Code folding allows you to temporarily hide user-defined sections or indented blocks (functions, loops, and so on). RStudio also offers shortcuts and menus that allow for quick navigation between blocks and sections.
Long scripts with many blocks of code can be hard to read. Often this is an indication that the script should be split into multiple files, but alternatively RStudio has a code folding feature that allows you to collapse blocks of code. All the blocks with curly brackets ({}) and code sections (see the following code snippets) can be folded. All foldable code is preceded with a small triangle. Clicking on the triangle collapses or expands a code block. That a block of code is collapsed can also be seen in the gap of line numbers. Here, the folded/collapsed function, the body of the function at line 5, is collapsed:
