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I am using QGIS 3.28.2 I inserted a layer contains contour lines and added points as elevation points. However to enter elevation value into feature attribute, only one digit is allowed.

I tried to change the data type from double to real but I could not find refactor menu from processing.

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From the processing menu, search for "Refactor fields" to change the data type:

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However, if only one digit is allowed, I suspect you need to also change the Length of the field.

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