I've trying to find the right source encoding that allows me to read correctly my attributes table with words that contain accents, "ñ, ü" and end in -"ción", but I still could not find the correct encoding. I've tried with "System", UTF-8, UTF-16, UTF-32, iso-8869-15, iso-8859-1, Windows-1252 and Windows-1250 and none worked I still see symbols in the spaces where there has to be an accent or a Ñ, ü or the termination "-ción". I am using QGIS 3.24.
I leave an image of what it appears to me in the attributes table. For example instead of saying Constitución appears Constitución; en vez de decir Desagües it appears DesagÌes:
