How to edit markdown cell in jupyter-notebook

Question

I am having a strange problem with jupyter-notebook.
I practiced a laptop that has markdowns and code cells.

When I save and reopen the laptop, I can edit the code cells, but not the labels.

Attempts:
1. Reload the page.
2. Make your laptop reliable.
3. Try changing the type of cell with markdown to code or raw, but still you can’t edit.

Note: I can remove several letters at markdown, but I cannot add any letters. Also, if I press Enter, it will create new lines, but I cannot write anything.

Question How can we edit the markdown cell jupyter-notebook?

The code is below:

https://github.com/bhishanpdl/Shared_to_public/blob/master/notebook_problem/example.ipynb

Answer 1

If someone encounters the same problem, I save this question and my solution, instead of deleting the question.

What I've done:
a) First go to the markdown cell.
b) Double-click the cell, now we can only delete letters, we can’t edit it.
c) Go into command mode (press esc) and return to edit mode (Enter) again.
d) Now we can edit the markdown cell.

This solved my problem.