4th

Add a little flavour to the E major by adding the 6 note

A great voicing with a unique sound, give it a try

It's in the 4th position becasue that's where your first finger is. Think of it though as based around the 7th fret where the tonic is. A really important chord in the blues.

The classic barre chord across all 3 strings. Doesn't have the 3 so can be used for major or minor but isn't really either.

The minor chord without the tonic leaves the important 3 hanging oput to dry a little and so may not sound like you expect it to. It's a good shape to grab though and could still be your best option in this position.

Another useful moveable voicing with the 5 in the bass and the tonic missing.

A useful voicing with the 5 in the bass and the triton on top

Again no tonic but a useful moveable position with the 5 in the bass

A moveable shape in the 4th position the tonic B is in the bass