It is a feature class in a geodatabase. However, searching in a old post I find the answer, It was in the selection tab - combination mode (for no reason it has changed to Remove from current selection). I just changed to create a new selection and It works. Here is the link of the old post: https://community.esri.com/t5/arcgis-pro-questions/solved-arcpro-unable-to-select-feature-with/td-p/361044 Thank you very much for your answers!
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