Greeting,
I want to prevent the changes when using the little square on a single row.
To do that, I am currently using the beforeChange method :
but, the probleme is the selection is not the true selection:
My question is: how to get the true selection using the square ?
we have a dedicated hook for the fill handle - beforeAutofill.
As shown on the screenshot we get coordinates (start, end) of the autofill action. Here Handsontable example - JSFiddle - Code Playground is an example that blocks the horizontal autofill but allows to populate values vertically.
Perfect, Thanks again @aleksandra_budnik !
You can close the topic 
