In my Notebook I have a fairly large initialization cell. How to make it close-able? I mean how can I roll up this cell in one line with ability to unroll it back?
Cell ▶ Grouping ▶ Open/Close Group toggles a cell group between open and closed. Closing a group collapses all cells in the group so that only the head cell is visible.
Initialization Cell. makes a cell auto-evaluate whenever the notebook is opened and the kernel is launched.
The classic solution is to put the initialization cell(s) into a Section (Alt+4) of their own, titled "Initialization." This Section goes either at the start or end of your notebook.
To hide the contents, you close the Section (double click its cell bracket at right of window).
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