I think Bar chords and Open chords may be mixing you up. Let’s say you are making an F major chord. On the first fret your 1st finger covers all the strings, your 2nd finger G string 2nd fret or the note A. 3rd finger A string 3rd fret or the C note, and last the pinky D string 3rd fret or the F note.
Now keep your fingers in that shape or pattern and slide them up 2 frets. You are now making the G major chord. Still not moving the shape, move up two more frets and you are making an A chord two more B, one more C.
Open chords do not work that way. Let’s say you are making an open D chord. Keep the shape and slide up 2 frets, it still sounds good, but it’s not an E chord. Make an open G, now slide it up 2 frets, It does not make another open major chord and it kind of sounds bad.
Learning the notes on the neck as you are learning other things now will advance you later by more than you may realize at this point.
