Let's take a look at some 7 chord shapes. Each of the examples below will have the same root note of D for comparison purposes.
For reference, here's the construction of each of the 7 chords in this lesson:
7 - 1 3 5 b7
maj7 - 1 3 5 7
min7 - 1 b3 5 b7
min7b5 - 1 b3 b5 b7
m(maj7) - 1 b3 5 7
Common 7 barre shape
Check out this great lesson by Paul Davids for some more context on 7th chords.