As you build more flows and their designs become more complex, the ability to organize your flows becomes more important. Flows have several features that enable organization on the canvas and folders to assist with organizing flows in the sidebar.
Colors
You can configure color highlighting for blocks. This makes individual blocks more distinguishable from other blocks around them. You can add a color by selecting a block, then click 
Change Color in the menu that appears. This also changes the color of connection lines extended from the block’s output ports.
Annotations
When collaborating with other people or putting a flow in a public workspace, it’s helpful to add directions directly on the canvas. This helps explain how to use the flow and what certain blocks are doing. Click 
Add Text in the toolbar to add an annotation. Selecting text in an annotation opens the text formatting menu which has bold, italics, and heading options. If you copy a link, then highlight some text and paste the link, the highlighted text becomes a hyperlink.
Groups
You can group blocks and annotations together. The group can then be named, given a color, resized, and have blocks added or removed from it. This can be useful when several blocks may be involved in performing a task such as sending an email.
To access the grouping menu, hold the Shift key and drag the cursor around a set of blocks. You can also select and hold ⌘ or Ctrl while selecting the blocks you want to add. Selecting the file icon will create a group.
