If you see a cursor in the cell and can write then its in. Headings The Headings starts with ie hash symbol followed by the space and there are six Headings with the largest heading only using one hash symbol and the smallest titles using six hash symbols. Markdown files Jupyter Notebook files Notebooks written entirely in Markdown Custom notebook formats and Jupytext reStructuredText files Write book content MyST Markdown overview Special content blocks References and citations Math and equations Images and figures Control the page layout.
Very very quickly this is how you can switch to markdown mode in Jupyter.
This post is a quick exploration of what this looks like. Markdown cells can be selected in Jupyter Notebook by using the drop-down or also by the keyboard shortcut mM immediately after inserting a new cell. Some examples from the MathJax demos site are reproduced below as well as the MarkdownTeX source. A great benefit of Jupyter Notebook is that it allows you to combine both code eg.