Enable/Disable vba code

I use the following code to hide rows which contain a specific value in a cell.
In the code below the row will be hidden when the value 1 is placed in any row in column E.

This is exactly what I need, although I want to have the option to hide and unhide the rows.
For example when entering a specific value in another cell like: in A1 the word hide or unhide to hide or show all rows.

How do I extend the script below to achieve this ?

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