Flex Input is the easiest way to get your content from where it is to where you need it to be. The Google Workspace extension offers the easiest way to edit rich HTML and Markdown directly in Google Sheets.
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Shortcut Keys
When in the Editor pane, the following shortcut keys can be used to navigate:
Ctrl+Alt+N: move to the next column cell (the cell to the right of the current cell).
Ctrl+Alt+P: move to the previous column cell (the cell to the left of the current cell).
Ctrl+Alt+U: move to the previous row cell (the cell above the current cell).
Ctrl+Alt+D: move to the previous row cell (the cell below the current cell).